I'm just wondering if I should keep my GTX 280 or go for the 4870X2. Since if i were to sell it, it would be best to do it now before the prices of the 280 drop, but one problem, the 4870X2 benchmarks dont all seem the same...on different sites there are different reviews and i'm not sure anymore.
OK, so you can't just add another GTX 280, with that MB and PSU. Just checking.
There are lots of benchmarks for HD 4870 CF and I'll use some to approximate the HD 4870X2. It should be very close.
The 4870 CF beats the GTX 280 in some games/resolutions (e.g. World in Conflict 1600x1200), but loses in others. To make it even more weird, look at Crysis 1920x1200. The GTX 280 wins by a negligible margin with 0xAA but the HD 4870 CF wins by almost 5 fps (16%) with 2xAA.