I’ve only been able to use memtest64 on Windows and so far it’s not picked up any errors, even when the system reboots. Will try the bootable version.I don't understand why you are waiting for reboots when running memtest. If you create a bootup USB stick with memtest it'll thoroughly test the memory correctly. This is what I did when I had issues with running xmp2 with my team group memory at it's correct speed...