Supposedly this is normal behavior with GPUBoost, not sure what settings you are running under afterburner to see clocks all the same @trucobit? The fan curves, OC settings, algorithms and miner programs you're running.

If you Google, many ppl will tell you that these acute thermal throttling happen at roughly 50 something degrees Celsius or higher from their experience. Factors at every moment that causes fluctuation from highest probably goes like this:

Temperature > load | voltage

To mitigate, easiest is to first run efficient cooling (or turn the fan up high, which generally kills the fan quicker especially with the low quality fans gigabyte uses)

Quality PSU, Risers, power cables that used with the risers

Remove power saving features in Windows.

Choose "prefer maximum performance" in global profile under nvidia control panel's 3D setting section. Sometimes you might have to use nvidia profile inspector to find and change hidden settings.

Use EVGA's KBoost to keep the cards running at max boost clock indefinitely (need some hack for non evga cards) at your own risk, normally not recommended.


Running random hash algos will always cause fluctuations, and mining software complicate it further since they assign loads differently on top of the shuffling algo orders.