I do stress test and benchmark with Furmark, and the "circle" would be lag(smoother normal then suddenly lag for a second, keep repeating like that smooth, lag, smooth, lag.....) my e6500 3.66Ghz first core is almost 100% while running the test. There is no other problem in the furmark screen, everything works fine except this. No matter I OC the graphics card or not same result. Any idea? My cpu is not fast enough so cpu 100% make the lag happen?