am2 x2 3800 ee--ballistix pc8000--abit nfm2

I have ballistix pc8000 2.2v 5-5-5-15 which is supposed to get worn out a bit if used at maximum voltage and currently it is at 500fsb...

what are the optimal kind of cas ras and voltages for it?

I have an AMD energy-efficient with a really cheap cooler.

stress test lasts a few hours at 2550 1.35v and 2 minutes at 2640. much more could I get out of it with half a kilogram of thermalright cooling? does it really make any difference with AMD?

does voltage really make much difference?