Hi.
I'm having issues with thermal throttling in my laptop, an MSI GS40 6QE Phantom.
This has always been a hot machine, running at around 80 Celsius in games / under load, and at 60~ idle.
More recently, though, the temperature has been increasing. Now, in games, like PUBG and Overwatch, the CPU temperature stabilises at 88-91 Celsius, causing the CPU to thermal throttle, a lot. I'm using the Intel Extreme Tuning Utility to monitor this: upon starting a PUBG game, for example, my CPU temperature shoots up to 88-91 Celsius, and my CPU clock speed gradually decreases, over the course of a minute or two, to around 1.6GHz from 3.1GHz and my FPS drops from 80-100 to 30-50. Occasionally, my clock speed drops to 0.2~ GHz for a couple of seconds, causing everything to lock up temporarily.
I've tried disabling Intel SpeedStep in the BIOS, to no effect, and I've just undervolted the CPU using the Extreme Tuning Utility (-1.5V - can't go any further), also not having much effect at all. Maximising the Turbo Boost Power Time Window appears to have helped a bit, but doesn't solve the root of the problem.
MSI Shift Mode is set to Sport, and I'm using the High Performance Windows power profile.
Since it's a laptop, I can't exactly upgrade the cooling; so I have no idea what I can do about this. I can say that pointing an external fan at it, while successfully cooling the keyboard, did not impact the CPU temperature.
Any suggestions?
Thanks