Hey guys I want to upgrade from my 550ti, and these two cards are on sale (both 2gb gddr5 models.) I am afraid that if I buy the 760, I'll certainly have some future-proofing for the next few years, but my cpu will bottleneck it. As it is $60 more than the 660, I want to make sure I don't waste my money. I have the AMD FX-4170 4.2 GHz cpu, 16 gb ddr3 memory, and a 750 watt psu. Thanks!