Luthier, anyone; which ram is which?

[Flyby]

I'm going to build a system that won't be cutting edge in any way. The one area that I would indulge myself would be the GPU, and it's looking like I might go for the AMD 6970. I figure the extra ram, per CoD's recommended GPU memory, can't hurt. Plus this card sits, performance-wise between the 570 and the 580, depending on the game. It may not have as long a future-proofing impact as a dual-GPU or even the 580, but it's ahead of the CoD requirements at the moment until Oleg starts "turning stuff on".

I'm no overclocking fiend here. I know [Hard]OCP still uses the i7-920 when it tests video cards, and states that it overclocks that cpu to 3..6ghz "to remove the cpu bottleneck" from it's testing. For what that's worth. But with Oleg's recommendation for a 2.66ghz quad, I know I have plenty of overhead for just how far I want/need to push my cpu.
As I said, I'm no overclocking fiend. I'm not one to replace a cpu at every new turn. Room to "grow". That's what I'm interested on. With air cooling, of course.

In the end, I want a fluid display experience, and as much immersion representation (eye candy) as my want will tolerate.

So, back to ram. Fluid play and cache ram on the hard drive? System ram? GPU ram? Can I take it all three help the cause? Those plus a good cpu and I'm in there. Right?
Flyby out