Just upgraded to a Ryen 9 3900x and after fresh installing windows with the latest GPU drivers and chipset drivers and motherboard BIOS it keeps crashing with WHEA_UNCORRECTABLE_ERROR while playing games.
The GPU and CPU are both at stock clocks, have never touched OC with them.
AMD Ryzen 9 3900x
AMD Radeon VII (Radeon Software Version
16Gb Corsair Vengeance LPX DDR4@3000Mhz
EVGA 850w PSU
ASRock X470 Taichi (BIOS Revision 3.43 - latest)
Another issue that I see is that in AIDA64 stress testing, when the "Stress FPU" option is selected, the CPU temps spike to 94c despite being at stock clocks and 1.35v on a 360mm AIO. Not sure if it's meant to do that, but it's quite worrying.