is prime 95 the only test for an overclocked cpu and does it realy take up to 8 hrs??
Not, it's not the only teset. It is, though, probably the most popular. There has been a lot of discussion about how long to stress test. I'd say 6 - 8 hours is average. Many test less. A few, including me, test for 24 hours.
i have a guide on overclocking and he was saying if this hapens up this voltage if that hapens up that voltage.
That's sort of true. But you shouldn't depend on just one guide. Overclocking is both a technical skill and an art. It does not lend itself to a cookbook approach.
does prime 95 tell you what failed and how to fix it??
Sort of and no. P95 will give indications of what went wrong. If the small fft's test fails,it indicates a problem with the CPU. If the large fft's or blend test fails, that indicates a problem with the memory. It will give you no help with fixing the problem.
and do ppl take classes on oc'ing or what how did ppl figure all this crap out lol.
Mostly, we figure out this stuff for ourselves - and the rest of the community. It takes a fair amount of technical knowledge, skill, and patience. It requires wading through lots of technical documentation.
sportsfanboy is right. Do one thing at a time. It's much easier to isolate a fault when something goes wrong. Along the same line, keep notes.
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Overclocking since 1978 - Z80 (TRS-80) from 1.77 MHz to 2.01 MHz