Nvidia 560gtx SE SLI usage problems

Intell(R) core(TM) 2 Duo Cpu e8400 @ 3.00 GHz
4.00GB ram
32- bit operating system windows 7
nvidia nforce680i LT SLI motherboard
ultra x3 800w atx power supply

2x Nvidia Geforce 560gtx SE SLI

I have been runnings games at ultra settings with high fps and then suddenly one day the performance drops dramatically to 5-10 fps for any game even at low settings. I ran msi after burner and ran diablo 3. The results were average cpu usage 50% while gpu 1 runs at 99% and gpu 2 runs at 10-15 %

Im not very experienced with sli would appreciate some feedback

P.S. I bought both cards about 2 weeks ago, but I didnt install sli till the second week because I had to wait for the sli bridge to come in the mail.
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More about nvidia 560gtx usage problems
  1. You need to re-install the graphics driver after you add a 2nd card in SLI. Did you? Is SLI recognized in the Nvidia control panel?
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