OP - If you haven't already, make sure each instance of WoW is using a different core. By default, WoW only uses the first 2 cores. It is possible that you're pegging your first 2 cores and the other 2 aren't being used much.
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OP - If you haven't already, make sure each instance of WoW is using a different core. By default, WoW only uses the first 2 cores. It is possible that you're pegging your first 2 cores and the other 2 aren't being used much.