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I run my Opteron @ 2.85GHz with 1.4v to be honest I'd rather lose 100-150MHz and use low volts, the FX55 scenario really put me off high voltage I never put more than 1.5v even when just trying for the highest clock, it's a sickening feeling when you have killed a chip. Don't the FX 60's run @1.4v std? If they do I'd probably go up to 1.55v max on that.