Gigabyte x299x MemTest86 memory errors

[cybertiger]

I would maybe try running in SINGLE CPU mode to see if the errors still occur.

In any case, there is strong indication of a bug in the UEFI BIOS.

I can't get errors from memtest86 any more nor single nor multi CPU mode.
But only from WIndows Memory Diagnostic at any speed except for 2133.
Appears that timings set by BIOS in auto mode are wrong as well.