Unfortunately, BIOS post test doesn't mean much for OC stability, as I found out recently. As long as you don't put some stress on your cpu, you won't know if your overclocking is successful. I can enter the BIOS at 4.2Ghz, but windows won't even boot at that speed (was just curious to see how high it'd go before crapping out, that's the highest I've tested mine).
One thing I can suggest for OC though, at first, test your cpu only, not both it and the ram at the same time. Otherwise you won't be able to know what the bottleneck is. Leave the ram settings at 5-5-5-15, ratio 1:1 at first and pump your fsb up. This will make sure that the ram runs well within spec, any orthos error you get will be caused by the cpu. Once you found your max cpu overclock, then you can tighten your ram settings and test for stability again.
Good luck!
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