THANK YOU.
I said exactly this a few posts back. Everyone seems so focused on the CPU when the biggest problem in his rig is
definitely the graphics card.
It's a 2 year-old GPU. It has no DX10.1, no tesselation, it's not future-proof and it's underperforming for many recent games!
Get a better graphics card. The final result will be lot more obvious than having 3 or 4 cores, or L3 cache.
As soon as DX11 and OpenCL really kick in, the CPU will be left with a lot less tasks than it has today. It's better to have a GPU with a lot of free shader processors to do some paralel computing -> Go with a HD5770 or at least a HD5750.
As I said before, save on the CPU (
Athlon II X3 i.e.), save on the motherboard (go with the 785G from
Biostar) and
get a better graphics card.
All this discussion about unlocking cores and disabled caches is completely irrelevant when you're seriously bottlenecked by the GPU.
About the power supply, we're talking here about a system that will consume around 200-250W, and the peak should hit around 300W. 380W should be tops if you overclock your CPU and GPU like hell. It's ridiculous to spend $100 on a 650W quality PSU.
Something like this is enough (and when I say "enough", we're already oversizing the power output to VERY safe levels):
http://www.newegg.com/Product/Product.aspx?Item=N82E16817171046
From Coolermaster, and it has dual 18A 12V rails - $35.
Or this, if you want something future-proof for upgrades:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817341017
Modular, from OCZ and has dual 25A 12V rails: $60.
A power supply has to be good, but it doesn't have to be expensive to suit your needs.