i have the same machine. i have 460 card but i needed to buy a new power supply because the one in the iextreme couldnt take the card. i got the card for 149 and the powerpack for 60.
my local computer shop installed them for 20.
ive now overclocked the graphics card and it runs awesome. far cry 2 runs on top settings and crysis runs on very high with 4xaa pretty smooth.
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can any 1 tell me if this model can run the sapphire hd6570 i have already upgraded the psu to 750w and tryed the card but i can not get the monitor to work with it , the card seems to have power as the fan is running . help please