Laptop Memory Upgrades (cont 3.....)

Other then the physical differences, DDR2 memory runs at a higher clock rate then DDR, and thus can send more information per clock cycle. The clock cycle is a synchronizing cycle used by computers to keep data being sent and received at the same time, so that the data flows smoothly rather then bottlenecking at odd points. This prevents data being sent in bursts and then having to wait for the processor or RAM to process it. It also means request that data be resent that might have been lost while other data was being processed do not occur.

Despite running at a higher clock rate then DDR memory, DDR2 memory is slower internally as it requires more organization to match the higher external clock-rate. This means that while DDR2-533 might seem like it's much faster then DDR400, the difference isn't so great that you should throw out your old laptop and rush out to buy a brand new one. With more memory, your laptop with DDR400 can outperform a laptop that has DDR2 memory.

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