SSDFC Smart Media Cards

SSDFC Smart Media memory cards

SmartMedia flash memory card is a removable flash memory card that can be used in several different types of digital devices; including digital cameras, digital music players and digital voice recorders. Smart Media flash memory is an elegently simple Flash RAM specification. A Thin Package Flash Memory IC is embedded in a card with a direct connection to the dataport. Smart Media cards from OpticsPlanet.com are fully compatible with all devices that run the Smart Media type flash memory cards. OpticsPlanet SmartMedia memory is one of the thinnest solutions for removable solid-state memory. About one third the size of a credit card and just as thin, SmartMedia is a small but durable format. Built with solid-state construction, with no moving parts that will wear down over time, our Smart Media will securely store your music, images and data.

The main advantage that SmartMedia cards have over the other memory cards is that because they read, write, and erase memory in small blocks of data (256 or 512 bytes at a time), you can more precisely select what data you want to save. Although the SmartMedia card was well received when it hit the market (especially the digital camera segment), SmartMedia cards have a few underlying weaknesses.

Capacities of SmartMedia cards are in sizes of 2mb, 4mb, 8mb, 16mb, 32mb, 64mb and top off at 128mb. Due to limited capacities, low transfer rates, it’s less sturdy encasing (compared to other flash memory card formats), the SmartMedia card has been replaced by other formats (primarily XD cards and SD cards).

OpticsPlanet.com SmartMedia has a simple structure in comparison with conventional memory cards. The NAND-type flash memory chip enhances the write and erase capabilities as data is rewritten in smaller increments. This results in improved performance through continuous data recording.
Optics Planet Smart Media card is a compact, reliable and competitive solution for today's digital devices.

SmartMedia Card Features:

* Thinnest Removable Form Factor
* SmarMedia Storage Capacities: 16MB to 128MB
* Nonvolatile Solid-State NAND Flash
* 22 Pad SmartMedia (SSFDC) Connector
* 3.3V Operation
* Low Power Consumption
* ID for Copyright Protection
* Automatic Program and Erase

Smart Media Card Applications:

* Digital Cameras
* PDA/Handheld PCs
* MP3 Players
* Word Processors
* GPS
* Cellular Phones
* Photo Printers
* Laptops

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Olympus xD-Picture Card

Olympus xD-Picture Card (Type M and Type M+)

Olympus xD (Extreme Digital) Picture Card is the ultimate reusable, removable digital media. Besides providing increased storage capacities at higher resolutions, it also offers compatibility with most manufacturers’ xD-compatible devices and is the only xD-Picture Card to support the Panorama function found with today’s Olympus digital cameras.

The Type M and Type M+ xD-Picture Card keeps your photo, movie and other files safe and sound so you can enjoy them any way you want (viewing, sharing, slideshows, etc.) and any time. The compact size lets you carry it anywhere and because it’s compatible with many reader/writers, you can download data to a computer or another device in a jiffy.

The Type M+ xD-Picture card is compatible with all cameras and is 1.5 times faster than the Type M card. The increase in speed may be useful in sequential shooting of digital stills and in the recording of high-density video with Olympus cameras.

When it comes to your pictures, quality and reliability can’t be compromised. That’s why the xD-Picture Card is the finest compact, durable removable media your camera will ever know

The xD-Picture Card is a flash memory card format developed and introduced to the market in July 2002 by Olympus and Fujifilm, and manufactured by the Toshiba Corporation. xD cards are in Olympus and Fujifilm digital cameras, and are available in a range of sizes, from 16 MB to 1 GB currently. A higher-performance xD card known as Type M came out in 2005, and uses Multi Level Cell (MLC) architecture. The 1GB Type M card is called the M1GB (M-XD1GM). Type M cards will eventually be available in sizes up to 8 GB, though the cards are not compatible with all older model cameras.


xD cards are available from a wide variety of manufacturers, they are not the most expensive format, and they also offers many advantages.As of June 2005, the maximum size of released xD cards compares favourably to the various other flash card standards. xD cards are available in sizes up to one gigabyte. Other smaller formats Flash Cards which match xD's size more closely have lower or the same capacity.

Buy more XD Picture Cards:www.oempcworld.com

RAMBUS MEMORY

184-pin Rambus RDRAM RIMM

RAMBUS:
Direct Rambus is a high-speed memory technology that uses a narrow 16-bit bus (Rambus channel) to transmit data at speeds up to 800MHz. PC600: 16-bit, single channel RIMM, specified to operate at 300 MHz clock speed, 1200 MB/s bandwidth


approx. 5.25” x 1.25”

The Rambus ® RIMM™ module is a general purpose high-performance memory module suitable for use in a broad range of applications including computer memory, personal computers, workstations, and other applications where high bandwidth and low latency are required.

Features

• High speed 1066, 800, 711 and 600 MHz RDRAM storage
• 184 edge connector pads with 1mm pad spacing
• Maximum module PCB size: 133.5mm x 31.75mm x 1.37mm (5.25" x 1.25" x 0.05")
• Each RDRAM has 16 banks, for a total of 256, 192, 128, 96, or 64 banks on each 128MB, 96MB, 64MB, 48MB, or 32MB module respectively
• Gold plated edge connector pad contacts
• Serial Presence Detect (SPD) support
• Operates from a 2.5 volt supply (±5%)
• Low power and power down self refresh modes
• Separate Row and Column buses for higher efficiency

RDRAM delivers pure performance where it matters most: leading-edge applications. Whether on multimedia, network packet switching, content creation, etc., RDRAM unleashes the processing power of your system. High-bandwidth RDRAM is essential to drive top performing processors. RDRAM provides a flexible solution to meet bandwidth requirements of tomorrow's high performance systems. RDRAMs system solution scales easily from 800Mhz to 1066Mhz to 1200Mhz. Additionally, commodity RDRAM components are configurable in a range of RIMM module configurations from 16 to 32 and 64 bit data busses. These RIMM module solutions offer up to 9.6 GByte/second of memory performance while retaining standard PC form factors.

There are 3 independent attributes that define which specification a RAMBUS module belongs to:

Clock speed: 800MHz, 1066MHz.
Latency: 45ns, 40ns, 32ns.
Bus width: 16-bit, 32-bit.

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PCMCIA Compact Flash Adapter

PCMCIA Compact Flash Adapter (CGI)

Description:
PCMCIA Adapter For Compact Flash Card CF Type I for use in notebooks and music keyboards with PC Card PCMCIA slots.
CompactFlash is used in such a wide variety of appliances ranging from PDA's, digital cameras and MP3 players that if you have a portable computer or system that is capable of accepting PCMCIA - this adapter is a must have. The PCMCIA CompactFlash adapter is true plug and play, requiring absolutely no drivers or software to enable you to transfer files.

Slip a CompactFlash Type I memory card (the most popular form of CompactFlash) into the adapter and plug it directly into your laptop, notebook or PCMCIA device. The CompactFlash card then appears on your system as a additional drive e.g. Drive E: so you can cut, copy and paste files in the usual manner.

The PCMCIA CompactFlash adapter can also be coupled with a "PCMCIA to USB" adapter to create a very low cost solution to transferring your photographs or data to your desktop PC

Use it to read and write photographs or files from CompactFlash cards in the PCMCIA slot of Windows 95/98/ME/XP/2000 or Mac Notebook computer (won't work with NT). The card appears as disk drive e.g. Drive E: under Windows. No drivers required for Mac and Windows. Use this adapter and a CompactFlash card as a low cost alternative to PCMCIA ATA cards.




ALT SKU: BPJ
SKU: CGI
Module Form Factor: Flash
UPC Code: 710348915514

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64MB PC133 144 pin SODIMM

64MB PC133 144 pin SODIMM

One of today's most versatile and powerful laptop memory chips are the PC100 and PC133 144-PIN SDRAM SO-DIMM modules. These cross-brand, cross-platform modules provide the best upgrade for PC100/PC133 Laptop systems. Support old as well as new models, these modules will give your Laptop that extra memory and speed boost it may have lost during its operation.


Description:

• 144-Pin SODIMM (Dual In-Line Memory) Module
• Pins: 144-PIN
• Plating: Gold Plated PINS
• TinyBga Technology Chips
• Serial Presence Detect with Write Protect Feature
• Voltage: 3.3V
• CL (CAS Latency): 3
• Clock Frequency: 133Mhz (PC133)
• Clock Access Time: 8ns
• Chip Configuration: 8 x 16

Technical Features:

• Single Pulsed /RAS interface
• Single Pulsed /RAS interface
• Burst Type: Sequential or Interleave
• Burst Type: Sequential or Interleave
• Automatic and controlled Precharge Commands
• Suspend Mode and Power Down Mode

Manufacturer's Description:

oempcworld is the world's largest memory manufacturer. In today's performance-driven environment, memory upgrades provide an easy, economical alternative to increase system performance. Every memory product oempcworld offers is designed to help you get maximum performance at the best price to you.

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SD Memory Cards :

SD Memory Cards For Every Need:

SD memory cards are extremely versatile in where they can be used. Depending on the format, SD cards are usable in cell phones and PDAs, in cameras and computers. It's even possible to plug them into game consoles such as the Playstation 3 and the Nintendo Wii. Because of all the places in which they are used, they are great for transferring data around.

For example, you can take a set of pictures with your camera, take the SD memory card out and put it into your game console to look at the pictures on TV. Or you can take it to your computer and, with a card reader, plug it in and save the pictures to your computer's hard drive. You can also use your computer to download a java game for your cell phone and place it on your cell phone without being charged service fees for downloading data to your cell phone.

You can also use the same cards in multiple places. The smaller microSD and miniSD cards come with adapters that allow them to be used in regular Secure Digital devices. This would allow you to use the same SD memory card in your camera, and then take it out and put it in your PDA to save some documents before putting it in your computer's card reader to save your documents and pictures before clearing the card for other uses.

SD memory cards are convenient and portable - the largest SD card is 24mm by 32mm by 2.1mm thick - or roughly an inch square. This allows you to worry less about the space your data storage is taking up, and you can easily take more then one card with you in case your first becomes filled up.

Flash media is also durable - unlike camera film or notebook hard drives, SD memory cards can survive being shaken around, exposed to sun and heat, and can even survive getting wet, as long as it's entirely dry before being put inside a device again!

So if you've been looking for SD cards, whether for your cell phone, PDA or camera, take a look at what we have to offer. In addition to the various types of SD memory cards mentioned here, we also offer HDSD cards if your device is one of the newer ones that takes advantage of this new standard. You should be warned that your HDSD cards will not work with non-HDSD devices, however.

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Cheap RAM MEMORY

When looking for memory for your computer, there are several factors to deciding the right RAM, but two things tend to stand out - price and quality. While it might seem that to get great quality you also have to pay a great deal of money, but it is possible to find cheap RAM without compromising on quality.

Quality doesn't mean that the RAM itself is brand name, from Crucial or Kingston or OCZ or Corsair, but that the memory chips used in the RAM comes from a high-quality manufacturer, such as Infineon, Micron, Elpida, and Samsung among others. By finding cheap RAM that has been made by high quality manufacturers such as these, you can avoid paying a price premium for retail packaging and brand names.

These manufacturers are the same ones used by OEMs- Original Equipment Manufacturers, such as Dell, HP, Compaq, and more for their memory needs. By buying RAM in large quantities and not having to pay for retail packaging or branding, this memory is available at a cheaper price than ram you’ll find at your local computer shop or box store. OEMPCWorld.com offers high quality OEM ram at discount prices.

Our RAM covers all types of memory, from DDR and DDR2 memory for desktops to laptop RAM for new and older laptops alike. We also carry the specific models of RAM needed for Apple computers, including the G3 series that Apple itself no longer sells memory upgrades for on their website. This RAM is checked to make sure it will work correctly with your Apple computer's model. We offer a lifetime warranty on our RAM, as well as a 30-day money back guarantee if you are not satisfied.

If you're curious or don't know what sort of RAM your computer uses, take a look at the memory selection utility below. Click 'Check Your System' if you're browsing our site from the computer you plan to upgrade, and our tool will check your system and report back what RAM you currently have installed, the maximum amount of RAM your system can take, and possible upgrades for your system.

If you know the model of your computer, enter it in the model field and you can find the same information about your system, including exact information about what amount of RAM you currently have installed. Otherwise, if you built your computer yourself or are just curious, take a look at the RAM listings on the left. We have plenty of different types of RAM to choose from, as well as flash memory for PDAs, cellphones, cameras and other devices.

256MB CF (Compact Flash) Card

256MB CF (Compact Flash) Card (CAW)

Description:
256MB 50-pin 2.7 MB per second transfer rate 3.3V and 5V dual voltage support 42.8mm x 36.4mm x 3.3mm CF CompactFlash Type I Memory Card for Digital Camera PDAs Mobile Phone Mp3 IA etc

ALT SKU: BJO
SKU: CAW
Module Form Factor: Flash
UPC Code: 710348913756

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72 pin,16 MB EDO SIMM memory

16MB EDO 72 pin SIMM 2K (AJQ)


Description:
16MB 72pin EDO DRAM SIMM 4Mx32 non-parity tin leads 5 volts 60ns 8 chip count max 1.0 inches tall - buy and install in pairs for kit - refurbished

Volume Price
Quantity Price Each
10-19 $6.64
20-29 $6.58
30-49 $6.51
50-99 $6.44
100+ $6.37

SKU : AJQ
Module Form Factor : Desktop
UPC Code : 710348902514

For more detail : http://www.oempcworld.com/

SD memory cards

SD Secure Digital memory cards

The SD Memory Card is a groundbreaking new bridge media that's helping to pave the way for tomorrow's fully networked society. This tiny, easy-to-use card offers a host of powerful advantages. It links various kinds of digital equipment through its easy connectivity that supports a host of application formats and does not require the use of a PC. Further, the SD Memory card has the broad interoperability and compatibility needed to ensure that its applications will continue to expand far into the future. SD Memory Card is well on its way to becoming the de facto standard memory card for digital connectivity. Soon, the SD Memory Card will provide universal access to an even wider array of multi-media data. The ubiquitous network era is coming, and its key is the SD Memory Card.

Five Main Features:

1. Compact and Slim:

The SD Memory Card measures a mere 24mm by 32mm by 2.1mm. Its slim, compact design promotes easy handling, an important factor for a "bridge media" which you can move between different appliances.

The miniSD^TM Card (measuring 20 x 21.5 x 1.4mm (W x L x T)) and the microSD^TM Card (measuring 11 x 15 x 1 mm (W x L x T)), are also available as smaller factors of the SD Memory Card.

The miniSD^TM card was developed to meet industry demands for downsizing mobile phones. It is only 37% the volume of an SD Memory Card. Despite its tiny size, the miniSD^TM card offers all the benefits of the original SD Memory Card. By inserting the miniSD^TM card into the miniSD^TM adapter, you can share a variety of digital data among standard SD-enabled products.

The microSD^TM memory card is a functionally compatible with the SD memory card but is smaller in dimensions. The microSD memory card communication is based on an advance 8-pin interface and microSD memory card host interface supports regular SD or miniSD memory card adapter and operate as SD memory card.

2. Large Capacity
Small size is not enough. Capacity is equally important. SD Memory Cards are currently available in several capacities, and new 2, 4 and 8GB cards are on the way.

3. High-Speed Data Transfer
Increasing data volumes and the increasing range of digital content has created demand for memory cards with higher data transfer rates.

4. Copyright Protection
Content Protection for Recordable Media (CPRM), the copyright protection technology used for the SD Memory Card is developed by 4C

5. Expandability-SDIO
With SDIO cards, new functions such as Digital TV Tuner, wireless LAN 802.11b, FM Radio etc. are added to host devices equipped with SD card slots.

144-pin SODIMM

144-pin SODIMM

approx. 2.625” x 1”

The SODIMM is a smaller version of the DIMM. They are primarily used in Laptop although they are used in some others like the original tray-loading iMac computer. They have a notch in the bottom of the circuit board, which is offset from the middle, which makes inserting it easier to line up.

144-pin SODIMMs are commonly found in laptop and small profile computers. Each 144-pin SODIMM provides a 64-bit data path, so they are installed alone in 64-bit systems. 144-pin SODIMMs are available in FPM, EDO, PC66, PC100 and PC133.

The number of black chips on a 144-pin SODIMM may vary, but they always have 72 pins on the front and 72 pins on the back for a total of 144. 144-pin SODIMMs are approximately 2.625" long and 1" to 1.25" high (tall), and the heights may vary. They have one small notch within the row of pins along the bottom of the module.

For Installation Help please see "How to Install Guides"

USB pen drive

Features

• Smart and secure removable data storage for business and personal use
• Full compliance with the Universal Serial Bus Specification v2.0 and v1.1
• Offers utility program allows user to configure their password, device name and partition sizes
• Bus Powered-no separate power supply or battery required
• Shock resistant, noise-free and longer data retention
• Connector Durability: 10,000 times

Specification

Description

The USB flash drive is one of the fastest growing portable storage devices for personal computers. It takes full advantage of the speed and popularity of a USB connection and the non-volatile, low-power consumption characteristics of flash memory technology.
PQI offers a variety of stylishly designed USB flash drives which are small in size, but powerful in performance.

Interface : USB 2.0 & 1.1

Capacity : USB 2.0: 32MB/64MB/128MB/256MB/512MB (Dark purple) USB 1.1: 32MB/64MB/128MB/256MB/512MB/1GB (Dark blue)

Data Transfer Rate : USB1.1: 12Mbit/sec / USB2.0: 480Mbit/sec

Write Protect : Yes
OS Supported : Windows 98SE, ME, 2000, XP; Mac OS 9.X & 10.X
Power Supply : DC 3.3/5V ± 10%



Important!! Please make sure the driver matches the part number on your pen drive before you download.

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PCMCIA ATA flash memory cards

PCMCIA ATA flash memory cards

PCMCIA ATA Flash Cards combine advanced Flash controller technology and NAND Type SLC flash memory.

The PCMCIA ATA Flash Card come with commercial (standard) operating temperature level (0°C ~ +70°C) and industrial operating temperature lever ( -40°C ~ +65°C) to fulfill various specialized applications in normal or harsh operating environments.

PCMCIA ATA Flash Card is ideal solutions for critical applications which request for long term supply with consistent key components.

System Features

• Enhanced ATA/CF Flash Controller and built-in NAND Type SLC Flash Memory Chip
• PCMCIA Version 2.1/JEIDA 4.1 Compliant
• ATA/True IDE Mode compatible
• Very low power consumption
• A high reliability based on the internal ECC function
• Supports power down commands and Auto Stand-by / Sleep Mode
• +5V ±10% or 3,3 V ±5% operation
• Wear-leveling Algorithm supported
• MTBF > 1,000,000 hours (about 114.15 years)
• Writing/Erasing cycles> 1,000,000 times (logically)
• Minimum 10,000 insertions
• Support OS Windows 31/95/98/Me. Windows NT/2000/XP/2003/Vista, WinCE, QNX, Linux, DOS and more
• Capacity: 16MB, 32MB, 64MB, 128M8, 256MB, 512 MB, 1GB, 2GB, 4GB.(unformatted)

For more detail please visit : www.oempcworld.com

Is Cheap RAM still high Quality?

When looking for memory for your computer, there are several factors to deciding the right RAM, but two things tend to stand out - price and quality. While it might seem that to get great quality you also have to pay a great deal of money, but it is possible to find cheap RAM without compromising on quality.

Quality doesn't mean that the RAM itself is brand name, from Crucial or Kingston or OCZ or Corsair, but that the memory chips used in the RAM comes from a high-quality manufacturer, such as Infineon, Micron, Elpida, and Samsung among others. By finding cheap RAM that has been made by high quality manufacturers such as these, you can avoid paying a price premium for retail packaging and brand names.

These manufacturers are the same ones used by OEMs- Original Equipment Manufacturers, such as Dell, HP, Compaq, and more for their memory needs. By buying RAM in large quantities and not having to pay for retail packaging or branding, this memory is available at a cheaper price than ram you’ll find at your local computer shop or box store. OEMPCWorld.com offers high quality OEM ram at discount prices.

Our RAM covers all types of memory, from DDR and DDR2 memory for desktops to laptop RAM for new and older laptops alike. We also carry the specific models of RAM needed for Apple computers, including the G3 series that Apple itself no longer sells memory upgrades for on their website. This RAM is checked to make sure it will work correctly with your Apple computer's model. We offer a lifetime warranty on our RAM, as well as a 30-day money back guarantee if you are not satisfied.

If you're curious or don't know what sort of RAM your computer uses, take a look at the memory selection utility below. Click 'Check Your System' if you're browsing our site from the computer you plan to upgrade, and our tool will check your system and report back what RAM you currently have installed, the maximum amount of RAM your system can take, and possible upgrades for your system.

If you know the model of your computer, enter it in the model field and you can find the same information about your system, including exact information about what amount of RAM you currently have installed. Otherwise, if you built your computer yourself or are just curious, take a look at the RAM listings on the left. We have plenty of different types of RAM to choose from, as well as flash memory for PDAs, cellphones, cameras and other devices.

If you’re not convinced cheap ram can be just as good as brand-name ram, read about OEM products

Flash Memory Options

Flash Memory comes in a lot of different formats for a lot of different purposes. It can be used for everything from PDAs to cell phones, from holding pictures on cameras to pen drives that let you carry your documents more easily. The reason for the popularity of flash memory is its great storage in a small size, as well as the durability of the media. Flash media is more capable of surviving falling, being stepped on, or even having liquids splashed on it then film rolls and hard disks.

What types of flash memory are available? The most popular types include Compact Flash, Secure Digital, and Sony’s Memory Stick Pro. Compact Flash is most often used in personal cameras, and comes in sizes ranging from 32MB up to 8GB. Having a 1GB Compact Flash cards in your camera has become very common, enabling you to take photos all day without worrying about filling your card.

Secure Digital, or SD memory, is a much smaller format then Compact Flash, which makes it perfect for cell phones and PDAs where space is at a premium. At the same time, the tiny cards can carry nearly as much data as the larger Compact Flash cards. A 2GB Secure Digital flash memory can cost less than $20, allowing plenty of storage for your PDA or cell phone.

Memory Stick Pro is used in both cameras and the PSP portable gaming system. This Sony Brand memory tends to cost a bit more then Compact Flash and Secure Digital per megabyte, but is proprietary in a number of Sony produced devices.

Finally, there are also USB flash memory drives available, ranging from 64MB all the way up to 16GB drives. A 1GB drive can carry around more data then a CD can, and can be written and re-written to over and over again.

So if you're looking for flash memory for your camera, cell phone, PDA or PSP, take a look at what we have to offer. We also have Smart Media, MultiMedia and XD Picture Cards available for you to browse through.

What is DDR3 Memory?

Several major DRAM manufacturer have made announcement, they are supplying the industry's first DDR3 devices and modules to leading PC industry developers for

evaluation by early 2007. Intel’s Bearlake chipset will be the first to support DDR3 and it is expected to arrive in the third quarter of 2007

Key Features

• The DDR3 components are twice as fast as today's highest speed DDR2 memory products.
• The first computer systems equipped with the advanced DDR3 memory technology are expected to arrive in 2007.
• The main advantages of DDR3 are the higher bandwidth and the increase in performance at low power.
• The DDR3 SDRAM devices will offer data transfer rates up to 1600 Mbps (megabits per second).
• The supply voltage for the memory technology is being reduced from 1.8 volts for DDR2 to just 1.5 volts for DDR3 targeting a work day equivalent of battery time. The

voltage reduction limits the amount of power that is consumed and heat that is generated in connection with the increase in bandwidths.

Component densities: standardized from 512Mbit thru 8Gbit.
The most important densities will be 512Mbit and 1Gbit at the beginning, later on a 2Gbit and eventually 4Gbit component to follow.

Module densities: from 256MByte up to 8GByte for standard JEDEC modules.
Higher module densities beyond 8Gbyte for special applications like servers may be introduced later on.

Features:

DDR3 SDRAM Components:

• Introduction of asynchronous RESET pin
• Support of system level flight time compensation
• On-DIMM Mirror friendly DRAM ballout
• Introduction of CWL (CAS Write Latency) per speed bin
• On-die IO calibration engine

What Types of PC Memory are There to Choose From?

What Types of PC Memory are There to Choose From?

So you're looking for PC memory to upgrade your system with, but aren't quite sure what you're looking for. Hopefully we can help you with some information about the various types of memory that are available to choose from.

The first type of memory to see widespread use is the 72-pin SIMM(http://www.oempcworld.com/Merchant2/merchant.mvc?Screen=CTGY&Category_Code=72pin). Unlike the 30-pin SIMM that preceded it, the 72-pin version had a 32-bit data bus, requiring only one or two memory modules to fill the system's data bus, as opposed to the four or eight 30-pin SIMMs that had been required before that. The 72-pin SIMM these days will need to be installed in pairs, as almost all systems have a 64-bit data bus, and come in sizes ranging from 8MB to 128MB of memory. So if you want to add only 128MB of PC memory to your system, remember to get two 64MB memory modules(http://www.oempcworld.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=64M-EDO). Otherwise, make sure what type of 72-pin SIMM you need, as there are two formats - FPM (Fast Page Mode) and EDO (Extended Data Out), and not all motherboards will work with both types, not to mention that you will need to make sure that if you are adding RAM to your system, you install the same type as is already being used.

The replacement for the 72-pin SIMM PC memory is the 168-pin SDRAM(http://www.oempcworld.com/Merchant2/merchant.mvc?Screen=CTGY&Category_Code=168pin). The 168-pin SDRAM has a few advantages over the 72-pin SIMM, but the greatest advantage is the 64-bit data bus used by the memory. This means that each module communicates with the system's data bus without needing to pair memory together, and allows for upgrading the memory one piece at a time. In addition, SDRAM operates at a higher speed then 72-pin SIMMs, operating at 66MHz(http://www.oempcworld.com/Merchant2/merchant.mvc?Screen=CTGY&Category_Code=PC66), 100MHz(http://www.oempcworld.com/Merchant2/merchant.mvc?Screen=CTGY&Category_Code=PC100) or 133MHz(http://www.oempcworld.com/Merchant2/merchant.mvc?Screen=CTGY&Category_Code=PC133). The size of memory available in 168-pin SDRAM varies widely, from 32MB(http://www.oempcworld.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=32M-PC100) up to 1GB(http://www.oempcworld.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=1.0G-PC133) modules. The most common sizes in use these days are 256MB(http://www.oempcworld.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=256M-AP133) and 512MB(http://www.oempcworld.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=512M-PC133).

PC100 vs PC66

PC100 vs PC66

Use only PC66 Memory in TX and LX systems requiring 4 clock RAM Intel
Ver 1.0 Compliant. Do not use for VX systems. Specially made SDRAM
modules are required for VX systems.
Using the wrong memory speed in a system has a number of problems
associated with it, the first being it may not work. If the slower
memory does work in your faster machine then you have slowed down the
entire system and defeated the purpose of the new machine. For maximum
performance and cost effectiveness only use the correct memory per the
system specifications.

In an effort to answer some of the many questions regarding the "New"
PC100 bus memory I have assembled this white paper. I will focus only on
the differences and try to avoid a technical paper on how it works. The
paper is broken down into two parts with the first being the physical
differences between the two types of memory modules. The second part
deals with the systems issues with PC100 and PC66.

Physical Similarities and Differences
Intel created both the specifications for the PC66 and the PC100 SDRAM
DIMMs which tightly define their electrical characteristics. Both the
PC100 and PC66 SDRAM modules are 168 pin, 3.3 volt DIMM with SPD "Serial
Presence Detect". The signal pinouts or where the signal pins on the
connectors' locations is the same for both types of modules.

Both start out with the same basic concepts and similar physical
appearances but both are really quite different from performance
aspects. On the module itself, the PC100 specification requires that the
length of the traces be kept shorter than the PC66 modules. The shorter
the traces the faster the electrical signals can travel on and off the
module. The routing of the traces on the PC100, because they need to be
kept shorter, have to use a 6 layer PCB as
compared to a 4 layer PCB used on the PC66.

What is EDO Memory?

Extended Data-Out (EDO) is a DRAM chip technology which improves memory performance 10 to 15% over equivalent Fast Page Mode devices.

Computer systems must be designed to take advantage of this performance increase EDO offers.

Intel's Triton Chip set, used in Pentium-class computers, are designed to do just that. EDO memory may be installed into most other computer systems but they will function and perform
as a Fast Page Mode memory module.

How does EDO Work?
DRAM's are designed as a matrix of bits. Each bit is accessed by a row and column address. A memory controller inside a computer system provides those addresses to access the data that each bit contains.

A 60ns DRAM will provide that data to the memory controller within 60ns. But there are certain time constraints for the memory controller to set-up the addresses, receive the data, and prepare for the next cycle. An entire memory cycle can range from 85 to 120ns.

Fast Page Mode can decrease cycle times by allowing the memory controller to access other data bits which are in the same row address. This saves time by not having to set up the next row address instruction. Data accessed in the same row is referred to as a "page".

Extended Data-Out (EDO) can improve cycle times even further by allowing the memory controller to begin a new column address instruction while it is reading data at the current address. Unlike FPM, the data output drivers are not turned off when the memory controller removes the column address to begin the next cycle. This saves approximately 10ns per cycle.