To what extent does Source use quads?

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Looking at building one of my brothers an ultra cheap pc. Will a Q6600 be sufficient for 1920x1200 CS-S or should I be looking at a higher clocked Dual?

Just wondering as I've found source to run quite slow, especially on 64 player maps/zombies etc.

Thanks


Also, to what extent will a GTS 320mb limit counter strike source? He only wants to play that game.

 

[Pate]

Thanks.

Hopefully the quad when overclocked to 3ghz will be sufficient. the 320mb GTS seems very light, but it's cost me £15 so I guess it'll do for now