It's 99% likely that is the DPC Latency Issue. The beta 368.95 drivers have the DPC Latency fix for single cards. Not sure about the new drivers just released if they also include the fix, I know one of the leaked 369 drivers did not. But the newest driver is now 372.54 - anyone know if the DPC latency fix is included in this release?
8/16/16 at 12:52pm