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Computer plays dead from time to time when using Davinci

Joined
Apr 23, 2023
Messages
4
Motherboard
ASUS ROG STRIX Z390-E
CPU
i9-9900K
Graphics
RX 6900 XT
Hi,
Every now and then, using Davinci resolve, my screens goes "signal missing", even though everything seems normal: the power light is still on, fans spinning, motherboard's LEDs on. The only way to turn the computer back to life is to keep pressing the power button until it reboots.

It doesn't happen much, but I can make it "crash" on command using some openfx plugins (it will also crash with the same plugins in BMD Fusion).

It's the only real issue I had with that computer. It doesn't happen when editing on FCP, or any other software. Doesn't happen either paying VR games on windows.
.. but it was already happening when I first built the computer (OC 0.5.9 and Vega 56, now it's OC 0.9.8, Ventura and ASUS TUF RX6900XT)
I tested the RAM, with MemTest86, tried many options in the BIOS, but never figured it out. Activity monitor doesn't show any stress from Cores or GPU before the "shut down".

Any help to troubleshoot it would be appreciated.
 
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