OP even a single HD 7950 OC is better than HD 5870 CF in the latest DX11 games. i would suggest you sell the HD 5870 cards for USD 100 each and spend a bit more to get a HD 7950. smoother more consistent frames and much less power, heat and noise. if you are at 1080p I don't see you having any trouble maxing any game out there.
Here is the HIS HD 7950 iceq x2 boost for USD 250 . built on reference HD 7970 PCB. unlocked voltage and good cooler.
http://www.newegg.com/Product/Produc...82E16814161429
Here is the HIS HD 7950 iceq x2 boost for USD 250 . built on reference HD 7970 PCB. unlocked voltage and good cooler.
http://www.newegg.com/Product/Produc...82E16814161429