You don't need that much RAM either. I'm seeing that your graphic card is good, also your processor. If you're going to OC, your motherboard will allow you without problems. It's a good Z77 and they're prepared for that. You NEED to improve your cooling system, regardless if you OC or not. This game looks more GPU dependant, than CPU dependant (Judging by benchmark results), and I would aim to update your video card drivers and try to use the Nvidia Experience software. I would also check other app's running in the background (Antivirus, anti-malware, system monitor, other processes, programs) that could "stress" your hardware leading to those results. My PC has lower specs:

-Intel i7 2600K 3.4~3.8 Ghz.
-Motherboard H77M (Soon to be replaced by a Saberthoot z77)
-NVIDIA GeForce GTX 550 ti (Probably soon to be replaced by a Nvidia GeForce GTX 660 ti)
-2x4GB Kingston RAM 1.666 Mhz (Even though my processor doesn't allow it to go up to 1.333 Mhz) (Total 8GB RAM)
-Windows 7 Ultimate 64 bits.

With those specs, running a high performance test, I get almost 6.000 points. So, I would see what's wrong first with your software before going after your hardware.