To those of you testing LinX or IBT... I am kind of expecting bulldozer to really do well here. It's AVX enabled, after all. Please make sure that, like sandybridge requires, you're using the latest avx build of linpack with your IBT or LinX.
I suggest LinX as it's just a drag/drop replace, and I'm not familiar with how to upgrade IBT. Also note that to utilize AVX, you must be running win7 sp1.

Also, if you get low GFlops... You should try as mentioned in this thread previously to disable half your cores (so if you have an 8c, disable 4), to remove any possible cache thrashing.