Originally Posted by Slink
Thanks! I didn't know about the specifics in regard to AMD chips.
In the light of your answer to my question, I would say that if I can find some higher-speed RAM with extra tight timings, and without an insane voltage requirement, that would be the cream of the crop, right?!
Ideally yes, but you're going to have a hard time finding memory over DDR2 950 speeds that has anything tighter than 5-5-5-15-2T. Like Pioneerisloud pointed out, buying DDR2 1066 RAM with 5-5-5-15-2T timings and underclocking it to DDR2 800 with 4-4-4-12-2T timings won't be any different than just buying DDR2 800 memory rated for 4-4-4-12-2T timings. 1066 is almost always more expensive than 800 memory, so your best bet is probably to just get a 4-4-4-12 set of DDR2 800.
CPU speed is far more important than RAM speed. Spending a lot of money on a set of RAM isn't a good idea IMO because the difference between running say DDR2 900 4-4-4-12-2T (really good for AMD) or DDR2 900 5-5-5-15-2T isn't really noticeable, but the price difference could be enormous. You'd be better off saving the money or spending it on a better CPU.
As for the statement about low voltage RAM being better, that's not necessarily true. With a CPU, a lower Vid means the CPU will usually overclock better than a CPU with a higher Vid because both CPU's have the same "max voltage" that can be safely applied, so the CPU with the lower Vid has more headroom. The same is NOT true with RAM, and the reason for this is different RAM uses different ICs (internal controllers). The IC of the memory determines the voltage needed and the overclocking capability of the module. A lot of the memory with lower voltage needs use ICs that frankly do not scale well with voltage. So even though one memory stick with a certain IC can run 2.2v no problem does not mean that a different memory stick with a different IC rated for say 1.9v can safely run 2.2v, or that increasing the voltage to 2.2v will give any improvement in stability.