Just in case anyone is having any issues with their drivers recently.
My twin 5870s were very happy on the 10.12 drivers; when I updated to 11.1 they ran like a three-legged dog on stilts and eventually crashed out.
Went back to 10.12 and calm is restored, silky BC2 rates no prblem at all. I don't know what they changed, but the 11.1 set does seem to be very much aimed at the 6xxx series, and actually detrimental to the 5xxx series.
If you're having any troubles with your 5870, 10.12 is a much, much better set.


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