Well all the e8400's i know can do 3600 with default voltage, mine too. So i think you should try it this way first and stop using auto voltage.
Really because no e8400 I know can do 3600 with default voltage. Look in the p5n32-e sli plus thread and you will find at least two e8400s, including mine, that need more than 1.300V to get this speed.
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