What was the temp on your GPU.. i'd say 99% during your long attack run your card was heating up... and then when the surface battle began your card shut things down to save itself from being incenirated by SH5. I AM runing a top end machine and I've had to do ALOT to keep my ATI card crom melting on ShS.
SH5 is very poorly optimized honestly, and it just doesn't run well with ATI cards. Try Down clocking... I believe Sober or somebody mentioned that I did it and got very little difference but since then have gone to a liquid cooled case and have been able to keep my overclocked 5870 at around 70C.
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