I currently have an AMD Phenom II X3 720 Black Edition with the fourth core unlocked overclocked to 3.4, 4 gigs of ddr2 1066 ram, Antec 650 watt power supply, running Windows 7 64 bit, with an nvidea 8800 gt graphics card. I want to upgrade the graphics card but am wondering how powerful of a card can I get without bottlenecking my system?
Also, I am running a 22 inch monitor at 1920 x 1080.
The cheapest and probably fastest for the money card available, i own two of these in SLI, superb gaming. Sure, I agree with HostileDonut that you cannot really beat 570 in this situation and that is a good product, but its out of stock now, and if you think of the longer run, if youre into SLI, this card gives you superb scaling and has faster clocks though less cores.
You can oc the 570 no worries, but that would increase your max load on PSU by quite a lot, plus higher temps. IMO, a double fan and heatpipe solution beats the traditional heatsink and processor cooling solution in EVGA. But again, its your budget and your choice. Good luck.
P.S. you will not see much of a bottleneck, if any, as long as you are gaming in 1080p+ resolutions.