Hey guys. I recently purchased a GTX 670 out my need to finally upgrade for max settings at 1080p. I have not yet overclocked it, although my particular non-reference card is stellar for doing so. I've tried to run a few games and my performance is almost exactly the same as it was with my 570. Sleeping Dogs with high AA runs like before - high 30's, low 40's. I'm seeing 680's get 114 FPS max, and I get ~60 max.
i5-2500k @ 4.7
p8p67 (Not great, cost me about $170. Didn't want SLI, so I bought a non-SLI board.)
What is the clock speed on your RAM? You should be fine if yours is above 1600. Also make sure you are running the sticks in a proper dual-channel configuration, otherwise you're halving the available memory bandwidth.
Are you absolutely certain your cpu overclock is completely stable?
What power supply (exact model name/number) are you using?
There's your problem. Take a stick of ram out such that you have one stick in each channel (so one in slot 1 and one in slot 2 leaving 3 and 4 empty), and run the benchmark again. You probably have a memory bottleneck from not running in dual channel, which only works when the channels are populated with equal amounts of ram.
I would recommend g-skill, they also have great memory timings which combined with 1600mhz speeds reduce latency, which can be helpful in speeding up almost anything. Plus they have very competitive prices. Also you won't need more than 8gb ever unless you open like 40 tabs in firefox and play multiple video games and have office open and edit video all at the same time.
G. Skill 2x4gb 1600mhz 8-8-8-24 http://www.newegg.com/Product/Product.aspx?Item=N82E168...
When you get whatever ram installed boot into the bios and make sure you are running dual channel at 1600mhz, if not turn on xmp and select the right memory frequency.