Hi, I have been looking into many cards lately as I have wanted to upgrade. The 4 cards I have saw which have caught my eye have been HD 7870, HD 7950, gtx 660ti and gtx 670. I have also considered crossfireing my 6870 but I have heard a few bad things about it.
Amd phenom ii x4 965
Motherboard: asus M5A99X EVO (if I remember that correctly)
Hybrind synergy 504w
I also play on a resolution of 1680x1050
But wouldn't I have to overclock the 7950 for it to reach the 670's performance ??
Not exactly unless that is when/if you are play highly nvidia biased titles like BF3 and Batman. Even then the HD 7950 is within a stones throw even without OC. Typically an OCed HD 7950 will bang with the GTX 680 https://www.youtube.com/watch?v=UcKWzVkgspc