mooty96 :
I have a gtx 660 and am wondering how much of a performance increase i would see if i buy another and put them in SLI?
From my point you shouldnt buy another 660 and sli them,most games don't have the drivers to run sli configurations,so better save money and buy a high end GPU like the 780.And also dual 660s in sli means you get performance a bit greater than the 670 and it wont perform upto a 680 so better save money and buy a high end gpu like the 780