MemTest86

Just incase can you go over what cpu, mobo and ram it is?

I am skeptical about RAM being an issue most of the time. It's tested at the factory and then shipped out. The chips don't suddenly say "sorry chief i ain't doing this speed no more". Make sure you do a full cmos reset to get rid of any weird settings from previous ram and also make sure you have the RAM in the correct slots.

This was the original set I purchased when I moved to AM4. I later picked up another 16gb set, identicle set that is, to give me 32gb.
5900x (stock)
B550 tomahawk
32gb DDR4 Corsair Vengeance Pro (now 16gb and running under XMP)

Tested the 2nd set I purchased, was fine, 1st set was showing errors.
 
I have a B550 tomahawk and I'm having trouble getting memtest86 to start. I used it with a Gigabyte X570 aorus elite no problems. Only option I can't try it using CSM instead of UEFI mode because the bios doesn't seem to have that option. I wanted to start trying a bit of overclocking but don't want to risk loading windows without first a pass of test #7 memtest86+.

You booting it off a pen drive i assume? I'm not sure I can be of much help, I just created the bootable drive from the ISO and then rebooted and selected the drive under F12 boot options (if it's F12).
 
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