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Benchmark usually does not require uber CPU to get GPU usage to 100% like games do.I also ran 3DMARK11 again and both GPU's went to 100% usage?
Well, I don't think there should any problem with you board...I agree with above that the E8400 is not fast enough to provide the scaling needed for making most of the SLI GTX460. But yea the crashes is a separate unrelated issue.Ah OK. But what about the Bus interface of my 2 cards?

Cant use a 8x slot as there isnt room
Really dont want to reinstall. The fact that 3DMark 2011 runs fine with a decent score is confusing. I know 3DMark doesnt stress the cards but surely it stresses them enought that if it crashes in games within minutes it would crash in 3DMark?