OK to use as will it go up in smoke? Sure usable, however it is not a stable O.C. I would back off the O.C. or adjust my parameters till I got 100% stable. Try Intel Burn Test (http://www.softpedia.com/get/System/Benchmarks/IntelBurnTest.shtml). Run 10 passes at max and see what goes on. Takes less time and if it goes the 10 you are good to go. 20 passes is the max recommended. You can run the good old Prime also to test the system.