I have just bought a SAPHIRE NITRO R9 390 and have had some problems with it. even at idle with no overclocking, both side panels off, the front panel off, and a 24" fan on high pointing straight at it. the idle temp is still at 50C and when I boot up Fortnite, Apex Legends, or CS:GO those temps go up to 100C! This causes the game to visuals to freeze but the audio to stay fine. The only way for me to fix this is to do a hard restart with the power button on the case. I will also get a message saying that WattMan settings have been reset due to unexpected system failure. I have not touched a single setting in WattMan.
CPU: Ryzen 7 2700x overclocked to 3.9 GHz
MDB: ASRock B450 Pro4
RAM: Geil Super Lube 2x4GB overclocked to 2666 MHz
PSU: EVGA 650w G2 80+ Gold
GPU: SAPHIRE NITRO R9 390 not overclocked Previously an NVIDIA 1050 ti that had no problems
Case: Cooler Master MB520 RGB