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Question: Stok or OC ????

First of all sorry for my poor english.
I have this mobo P5kpl-am,proc E5300 2.6ghz"stok" and Sapphire HD 4670 1gb
and some boring PSU 350W
Have tried many times to OC the processor,but i can't go it up to 3.0ghz
iven i bumpet up all voltage to max. So finaly i live it to 3.0ghz with auto v core voltage and 1.3 over voltage , but i dont know yet is it stable or not? You should know, this is my first time trying to OC. I started Prime95 for 20 min and the temp diden't go up to 53C' i turn off prime95 cos i was bored waiting,and start playng crysis in midium sett about 2 hours,and it work's fine, but was no diferenc! my fps falls doun to 15 and juped to 40 agen. So OC was nothing.