I have the OC pre overclocked system I7 920 running at 4Ghz. Have had very little trouble with the system, some teathing trouble at first but OC sorted it. However, I have just run Core Temp and it only shows 2 Cores? This has not happened before, any help or advice would be much appriciated. Does this mean the processor if failing?? Bought 22 Dec 2009.