I purchased another 5870 from the MM so i could run Crossfire. I found that i could play BF3 for around 40minutes then it would become a slide slow, massive stuttering it became unplayable.
I installed the MSI Afterburner app and recorded a log of the temps and gpu usage whilst playing and when the stuttering began, the second GPU was slowing down to around 25% usage.
Uninstalled the 11.10 Drivers and went back to 11.9 and it is now working perfectly. Thought i would put this up as it was driving me mad and it may help someone else.
I installed the MSI Afterburner app and recorded a log of the temps and gpu usage whilst playing and when the stuttering began, the second GPU was slowing down to around 25% usage.
Uninstalled the 11.10 Drivers and went back to 11.9 and it is now working perfectly. Thought i would put this up as it was driving me mad and it may help someone else.