Another thing you can try is to set the standard 7-7-7-24, but start at a lower clockspeed for the ram with all of the other settings at auto. If you then bring the memory speeds up slowly, the auto settings might be able to adjust to the higher clockspeeds. (That's what I intend to do with mine on the MSI board I've got, and then I'll go in and try to tighten those timings up from the auto settings afterwards).
I'm not sure how dependant on secondary timings the AM2/3 platform is, but the S939 platform could get quite a boost from tightening them.
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