Ok, I was about to go with the 4870, but im worried about power usage.
My machine right now has a Corsair 520w psu. 3 hard drives, 1 cd/dvd drive, Intel quad core processor @ 2.66ghz, 4gigs of corsair ram, and then a energy effiecien motherboard from gigabyte.
I run no other cards except for the video card, but will my PSU handle the 4870? Or should I step down to the 4850?