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Did a couple more tests. First same 5900XT and 2x32 ECC DDR4 3200 but on a x570 motherboard - all OK. So the CPU can work with the memory on another motherboard. Then again with B450D4U-V1LQ5: Added extra fan blowing directly to VRM heatsink. Heatsink now noticeably cooler. Still crash. Same...

Before crashing memtest shows the CPU max temperature I think around 78C. VRM temperature during test I have not checked, will try to do that with a thermocamera. Otherwise the system is in a closed 2U case with Dynatron A47 cooler and 2x 80mm case fans. Fan settings are on auto in BIOS and...

There is no BMC on this board :), only AST2510 VGA

When the crash occurs, fan speeds go down, power usage sinks to 20W (from around 33W when idle). And the power button will not shut down the machine. One has to pull the power cord out to boot again. Googling around I got the impression this points to IMC crash. Lowering the ram speed from 1600...

Two bits of information: - I managed to read out fan RPMs in Linux on this board. All info is here: https://github.com/AndrewLinden/nct6779_ahb - I made a new version m3 of modified BIOS that now has hopefully all CBS submenus available (to for example set the SOC voltage) Find it here...