I stressed to only use wattman and gpu-z because of a known issue iv seen for quite awhile. If you have AB or any other OC program you might be oced way higher then you think. If that is not the case yeah I would contact your mobo and or gpu mnfer cause thats to hot, if you are running at stock.
"Uninstalling Radeon Software may fail to remove Radeon Settings." - Old known issue, but still persists for some people? Including me.
Try 100% fan speed and or If you have a fan of any kind, point it at your card in that open case. That will at least eliminate the possibility of weak air flow. No you shouldn't need 100% fan speed at stock.
Wish I could be of more help!
Sapphire Radeon RX 5700 Non XT Boost Core 2035 Gaming Ram 960 43c Air Water Hybrid Cardboard Blower with a 20$ chinese Waterblock on the core 50 gallon tote of water, Ryzen 2600 4.1 ghz, 15$ chinese waterblock, same tote 3200 ddr3 cl16 Team T-FORCE VULCAN TUF , B450m Asrock Pro 4 Mobo, 700 Watt OCZ PSU.