Version 7.4 is multicore support problem.

[mat9v]

My friend and I have tested v 7.4 free and on 2 computers equipped with Asus Prime X370-Pro with Ryzen 1700 and 1800X CPUs the program complains that UEFI firmware is corrupted? and disallows multicore operation - only working in single core mode. Version 7.3 worked fine on the same motherboard/cpu combo.

[David (PassMark)]

What was the exact message? I don't think there is any message about corruption in the MemTest86 software.

There are certainly motherboard with buggy firmware however. See this post for details.
https://www.passmark.com/forum/memte...election-modes

What firmware release does your Asus motherboard have installed?

[mat9v]

Mainboard: Asus Prime X370-Pro
Bios version: 805
UEFI enabled.
In the photos you can see that version 7.3 has no problems detecting all 16 cores and happily tests using them.
V7.4 stops for about 10 seconds on "Retrieving CPU MSR Data..." and never shows "Testing multiprocessor support...", then in the menu shows that Multi CPU modes are unavailable due to UEFI firmware limitations. Sorry for substituting "limitation" for "corruption" - my bad, I was writing from memory the first time.
All of that on the same motherboard, bios and CPU combo. The same happens with my friend's setup.

[keith]

In MemTest86 v7.4, we added a blacklist.cfg file which contains a list of baseboards that have known firmware issues with booting MemTest86. Because we have seen multiprocessor issues with the Asus Prime X370-Pro, we have added it to the blacklist. See the following threads for reference:

https://www.passmark.com/forum/memtest86/37791-asus-prime-x370-pro-with-ryzen-1700x-rebooting

https://www.passmark.com/forum/memtest86/5743-list-of-motherboards-with-issues-when-running-memtest86-in-multi-cpu-selection-modes/page5

The latter one is using BIOS version 0805 but still experiences multiprocessor issues.

However, as it appears to be working OK on your system, you can edit the blacklist.cfg file yourself and remove the ASUS Prime X370-Pro entry from the blacklist. More details on the blacklist.cfg file is described here:

https://www.memtest86.com/support/index.htm

[mat9v]

There are modded bioses for our board available, so maybe the problems are with them. They require forced flashing because of broken signature. Anyway, with blacklist removed the program works correctly with my board/cpu combo. Thank you for the tip