Had this problem for quite some time. GPU keeps overheating and shuts down in a couple of minutes playing a game. Temperature rises very fast and the fans dont seem to be working. I've tried Setting manual fan speed in both Afterburner, Speedfan & Global Wattman. I've tried reinstalling drivers, uninstalling the old ones using DDU, Tried different versions of drivers: 16.5.3 & the newest ones. Installing a new motherboard didnt help.
Running a FurMark test ends up showing 99*C & 0 fan activity https://imgur.com/a/T9SJj
CPU: Intel Core i5 4690K 3.5 GHz 6MB
MOB: Asus B85M-G
PSU: Fractal Design Integra M 550W
GPU: Sapphire Radeon R9 380 4GB Nitro
Crucial 8GB (2x4GB) DDR3 CL9 1600Mhz Ballistix Sport
SSD 120GB
Running a FurMark test ends up showing 99*C & 0 fan activity https://imgur.com/a/T9SJj
CPU: Intel Core i5 4690K 3.5 GHz 6MB
MOB: Asus B85M-G
PSU: Fractal Design Integra M 550W
GPU: Sapphire Radeon R9 380 4GB Nitro
Crucial 8GB (2x4GB) DDR3 CL9 1600Mhz Ballistix Sport
SSD 120GB