This is a companion thread for this video:
What’s going on with ASRock AM5 Motherboards Killing CPUs (particularly X3D CPUs)??
Something’s going on, but it isn’t as universal/widespread a problem as the intel CPU degredation. We know the failure is ‘elevated’ and we know AMD and ASRock have been working hard on diagnosing the issue. We suspect that no real single/universal root-cause has been identified.
I have been working on this in the background for months. I thought I was on to something by looking at dead/dying ASRock Rack motherboards, but it didn’t pan out. Turns out those motherboards were not killing CPUS – it was (probably) just defective eeprom chips used for the bios.
BUT So I am testing newer ASRock AM5 motherboards and – so far so good.
Background
If you need more background, check out the reddit thread and Steve at Gamers Nexus excellent video.
This Reddit thread also has a lot of great information in it: 9000-series CPU failures/deaths megathread #3 : r/ASRock
Thanks, Steve!
What Did You Find?
Of the boards and cpus we got from viewers and supporters, we mostly got 7800x3d and 9800x3d CPUs, with one or two 7950X CPUs. The discoloration is in different places on our test CPUs, and they present with different symptoms.
What boards did you focus on?
The B850I Lightning Wifi
… this board did not murder any CPUs, despite our best efforts! ![]()
The x670E steel legend
While this board has not murdered any cpus, it is oddly flaky in unexpected ways. We observed some minor discoloration on the CPU when we got it in from the end user. Cleaning the discoloration has not resolved the flakiness on this board. We aren’t sure it is related.
We replaced the socket on another motherboard that for sure killed a CPU. It hasn’t killed again.
The other two boards appeared to have damaged sockets. We do not believe the sockets were damaged from factory. It may have been cpu misalignment during installation, or possibly excessive heatsink pressure (though we doubt that).
You know who you are – If you’d like to be @'d here as a thank you, I’ll be glad to. Two of our RMA experiences were done “secret shopper” style and I am not ready to give that away just yet– but we were able to get boards and CPUs replaced in a 1-2 week timeframe for the CPUs and board we elected to have replaced. (remember, we opted NOT to have one board replaced and just swapped the socket ourselves).
What’s the Hetzner Deal?
So the B650D4U boards I got to take a look at had a bad bios chip. Can the bad bios chip load bad control code onto the VRM and fry a CPU? I really REALLY thought that would be the smoking gun! But I don’t think that’s it anymore.
You can do field-replacement bios chips, sure, BUT there are areas of the bios chip that are not field reprogrammed. Typically this contains mac addresses for all the nics, uuid stuff, and may contain things that seed the RNG, pluton security processor… who knows.
Field replacement of the bios chips to repair these motherboards would have required having a tool to replace the MAC address or manually set it. Which… is fine… but commercial customers would probably rather do a board swap, or swap boards in batches. I believe this is why we saw wholesale board replacement.
I did side-by-side comparisons of before/after B650D4U server class boards for clues as to what might be happening in asrock consumer boards, but imho this is a pretty strong dead end.
Interestingly, we DID recover a board that would not post by replacing the bios chip. We were able to read the original bios with a programmer, and then programmed the image into the replacement chip. It still would not post. We used bios flashback with the replacement chip and the board has been working fine to this day, no issues.
This was the B850I Lightning Wifi that was in our “torture rack.” The CPU was fine, no discoloration, but the board did not post.
Lately I think ASRock has added more layers of integrity checking/checksum verification to try to detect corruption. Maybe that’s what happened here? I’m really not sure. If the BIOS bails on integrity checking fails then that might save more CPUs assuming that is connected to the root cause.
Grumble.
So yeah, bit of a nothing burger, but what’s next?
Safe Boards?
Our testing is currently focused on these three boards:
https://www.asrock.com/mb/AMD/X870%20Taichi%20Creator/index.asp
The Live Mixer X870
https://www.asrock.com/mb/AMD/X870%20LiveMixer%20WiFi/index.asp
X860 Nova Wifi
https://pg.asrock.com/mb/AMD/X870%20Nova%20WiFi/index.asp
… time will tell! But these are at least newer board designs.





