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Sandy ---- SuperPi is not a true indicator of stability.
2.4 GHz on a Winnie is quite good. So, I suggest that now, you hold back on the oc'ing and concentrate in the stability.
Run MEmtest for the RAM, and Prime 95 for the CPU.
In Prime 95, the small FFTs test is the most taxing for a CPu. So, choose that test and let it keep running forever
It should run for at least 24 hrs or more. But one thing I like abt Prime small FFTs test is that you can continue to use your comp normally. You will not feel that it is slow. You can even play games while running Prime. At those times, The game uses most of the CPU. The moment you exit the game, Prime 95 utilises 100% of the cpu again.
So, run Prime 95 for as long as possible. 2.4 GHz is a good speed and now, you have to make sure that it is stable