Sudden FPS lag cant find an explanation

So I built this pc in july of 2011, flawless performance since then. In the last few weeks ive done some upgrading and was enjoying nice performance until yesterday my fps in Diablo 3 dropped from ~60 to about 0-10 fps. Tried other games (BF3, LoL, CS 1.6) with extremely slow load times and then the inevitable frame rate

I restarted, reinstalled video drivers, checked connections, temperatues for cpu/gpu are low even under load. I rebooted multiple times and was able to use it flawlessly for about 5-10 minutes. After that brief period I was experiencing the same issues as before.

specs are

i7-2600k (stock clock)
Asus GTX 580 matrix platinum
OCZ Vertex 3 120gb ssd
Samsung spinpoint f3 1tb
8gb corsair vengeance
asrock z68 extreme 4
hyper 212 evo
tx750 psu
xonar ds 7.1

if I left something out let me know I just need ideas to try and am at my wits end.
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