[The Storm]

The CPU and RAM are good enough to play CS, about GFX - any GeForce from series 6 up will do good, but if you like to play games anyway better get something like GeForce 8800 GT and one more Gig RAM. The tutorial that you have read maybe is more targeted to a Dedicated Servers( i.e. when you host a server but you are not playing as client in it from the same machine ). So I can say that the GFX have a lot of stuff to do with the FPS.