I have an AW 17 with a 780M. I was looping Unigine Heaven (1080p, 4xAA, Ultra) for the third or fourth time and the temperature was stable at 80C for some time already when the framerates dropped. Checking the GPU-Z logs, it turns out the GPU's clock went from 849MHz (VDDC=1.0V) to 614MHz (VDDC=0.9V). I stopped the bench and let the computer cool down to idle temps, and upon restarting the bench, it was still locked at 614MHz (VDDC=0.9V), the temp was around 60C. After that, I tried Unigine Valley, a game, MadVR with some heavy processing, the GPU was still locked at 614MHz (VDDC=0.9V). I don't think it is thermal throttling since the temperatures where reasonably cool when I restarted the various benches, rather, the voltage and clocks would drop when the GPU wasn't used to full capacity, but neither would go above 614MHz and 0.9V even when needed. A restart of the computer, and the GPU ran at 849MHz again, and the voltage went up to 1.0V again, I tried looping Unigine heaven again and encountered the same issue. I suspect that the voltage was locked because of a power issue, though I really have no idea. (Stock clocks, 326.80 beta, AW bios A04, stock vbios, no third party software like MSI Afterburner and the like) TL;DR: Looped Unigine Heaven 3 times, Framerate drop, 849Mhz (V=1.0V) => 614MHz (V=0.9V), stuck at 614MHz (V=0.9V) regardless of temperature, reboot unlocks full speed temporarily