I can't help you... just wanted to share my similar results. I think Sh5 cooked one of my 4870x2 as I started getting hardware failures and airtifacts, first in Sh5, then in windows. I removed one of my cards and can't help but think I am better off now just running one. I run Sh5 and the card with maximum settings with no performance issues at all (except for the mouse response, which seems to be a Sh5 issue). Things are quieter with less fans running too. I tried D3D overrider (the only Enhancer item I use), but see no gains when I try it in Sh5.
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