RAM Questions...

[bomath]

Originally Posted by WhiteSnake

[...]
Paired modules in Dual Channel are faster than double the amount in Single Channel.

That's a gross exageration. The theoretical benchmarks show at most 40% improvement (or even less for Core2Duo, because of its higly effective cache). What's really relevant is that (with a top-end machine!) you'd see at most 5-10% improvement in Sturmovik FPS coming from dual-channel; to believe it, just try your memory sticks on non-channel paired slots (like 1&2, if you use 1&3 for dual-channel).
Anything under 2GB is sub-par, and 4GB RAM is becoming the de-facto standard for gaming rigs. If only Vista-x64 SP1 would behave more nicely...