Have a look into the "technical threads" area. You will find a sticky post "recommended settinfs wit 1gb, 2 gb card" or something like that.
This thread also talks about the relations between the components a bit. I know, that somewhere here, a guy talks about the cpu usage turns into bottleneck as soon as 2 cores are not having the same amount of load. When one core tries to work 100%, then the bottleneck is already there. Aim is to have enough ghz to let the cores work on the same level up to perhaps 80%.
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