[ShadowPhoenix]

Ok, so seeing as a processor upgrade is out of the question for my Toshiba Satellite R20 Tablet (see my other recent post), I figured I'd upgrade the RAM in my laptop.

I've figured out that my laptop uses DDR2 SODIMM RAM (currently 2 512MB sticks). While I was looking for RAM, Toshiba listed two options for my RAM, either 533MHz or 667Mhz. So, after more looking, I found that the frequency meant either PC4200 or PC5400. Which begs the question, other than speed, what's the difference?

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Speed is the only difference. The figure is the theoretical maximum amount of data that can be shoved through the stick per second.
However depending on the processor the 667 memory may only be able to run at 533 anyway.

[Neil Jones]

Speed is the only difference. The figure is the theoretical maximum amount of data that can be shoved through the stick per second.
However depending on the processor the 667 memory may only be able to run at 533 anyway.

[ShadowPhoenix]

So, if I got PC5400 and my laptop was only meant to run PC4200, it would still work?

[Neil Jones]

Memory is backwards compatible so it will run at the slower speed if it needs to.