I doubt it is your RAM fwiw. When trying to extract the most I could from both Corsair Vengeance RGB 16-16-16-16-36 3333 2x16 ram and G.Skill F4-3200C14D-32GTZR ram I would get hard locks, Memtest failures, or generally bizarre behavior but no hard shut downs. The hard shutdowns I experienced were all due to hardware monitoring software trying to use it NZXT's CAM didn't play nice with HWinfo and it would hard shut down if I had fired up CAM at all during the session randomly and under seemingly light loads just as much heavy like p95. Things were made worse by having AiSuite3 installed and still just as bad with it "uninstalled" by the Windows uninstaller. The stand alone Microsoft uninstaller, while generally excellent, doesn't fully exorcise AISuite. Only the specialized removal tool did the trick. I had to dig around to find Ai3Cleaner to genuinely remove all traces of Asus software. Once I had done that the hard shut downs were much less frequent but still very much a reality where HWinfo and NZXT's CAM are concerned.

BIOS 060x, which shipped on the board I received, was the most stable and was noticeably less likely to have hard shutdowns. Revisions 070x and 0804 were all trouble for the Corsair kit and not a problem which makes no sense to me but a couple of weeks of hitting my head on the wall of bugginess has me convinced there is something to it. Both kits are Samsung B-die dram, but the G.Skill kit owing to much faster timing I elected to keep. That said, no hard shut downs that I could trace back to either kit of RAM, just other misc. bugginess along with seemingly much more rare hard shutdowns under that rev.

Anything that tries to query the custom Asus IC for extended hardware information seems to hard shutdown the board and nothing else... it's got to be some software touching that custom IC. Even Asus' own AiSuite3 was problematic in my usage. I did a multi-year stint running a small computer repair shop and I struggle to remember anything actually ever going down hard like what you and I have both experienced with this board. This reinforces my gut instinct something has to be trying to use that chip in your software environment. I could see a CPU thermal issue causing something like this or perhaps a wonky power supply but I can’t think of an instance of it having seen countless computers in that stretch running a repair shop.

If you happened to have loaded AiSuite at all, I suggest uninstalling it and all Asus software. One thing I have learned the hard way in 20 years is that Asus software has been and will always be pure trash. I gave them the benefit of the doubt after a 6 year hiatus from a self built machine of any kind but since pre 2k their software has been between a nuisance to unforgivable. Seek out and use the "ai3cleaner" executable. For aura use the "microsoft program install and uninstall" troubleshooting pack cabinet.

I didn't have Aura crashing anything but given that it, too, did not want to cleanly uninstall I consider it suspect FWIW.

You might try BIOS rev 060x. I discern no difference in my usage between it and 0804 but I run 0804 anyway.