Based on that HP model# it looks like you have a Phenom 820?
http://support.hp.com/us-en/document/c02479654
Very similar to mine which is HP p6667c (Phenom 830)
We have an OEM board so overclocking the CPU isn't an option (BIOS is locked)
Also max TDP supported is 95W, so not much choices for a...
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