So this has actually been a problem for quite some time now. I bought this computer with a GTX 580 and an i7 960. After about 6 months, I noticed that the 580 began severely under performing in benchmarks, but still got 45-60 fps in BF3. Now I have two gtx 660's, and at first they worked excellent. I OC'd my CPU with my two new cards to 4.2, completely stable, but when my streaming program stopped working I kept having to switch it back and forth between running at 4.2 and stock to see if my ram was the issue (I heard that had been an issue with Xsplit). After the multiple changes in the OC, the processor showed obvious decay and I can't Overclock it anymore. I run Far Cry 3 with 2x MSAA at around 40 fps, same with 4x. The first month I had the cards, I ran it at 60+ all the time. My Uningine also suffers pretty bad just as it did with the 580. The weird thing is, sometimes the cards will work like they are supposed to. every few weeks I'll decide to run my bench's, and I'll get the appropriate scores and FPS in games. I've monitored their load and it's always been at 95-99%, so it's not possible for it to be my CPU right? In this case, is something like my PSU frying my cards or could it be my motherboard which I've noticed has had some issues in the past? Thank you, sorry for the wall of text!
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3/22/13 at 3:23pm