Can Q9650 safely go 4+ GHz?

Stupido

Distinguished
Sep 17, 2008
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I have Q9650 overclocked to 4GHz (500x8), but I would like to try it bit higher. So far it looks like I'm not able to, so does anyone knows how far should I go with the juice while playing safely? Currently it is a notch below 1.4V...

Thanks!