Whats the fastest memory I can get?
That depends on the chip set. Intel has said that its 845 chip set will support 333 MHz chips in the very near future, while VIA, SiS and Nvidia have chipsets that will support DDR400 – although this is not quite an approved standard, and should only be considered if you’re keen on experimenting. It can approach, and in some cases exceed, the figures for Rambus’ PC1066 memory, which is still the fastest established standard.