Fast forward 4 days for the 4090 PC and the computer is reliably BSOD as soon as it logs in. Safe mode not impacted, normal mode with no GPU driver not impacted. Running 566.36, clean installed. Got the system back in and put old card back in, no stability problems. Then I start an RMA for the GPU before noticing the computer was using a lot of power for an idle system. Upon further investigation I've forgotten to remove F@H from the system
![Embarassed :oops:](./images/smilies/icon_redface.gif)
No other software is triggering instability in my testing. Including other GPU compute tasks that are causing higher (GPU) power usage then F@H. Furmark ran for several hours without crashing or overheating. Power target was then increased to ensure we have headroom and no issues seen (500w power draw). MSI Kombustor ran for several hours with no errors or issues detected. BSOD observed is always DPC_Watchdog_Violation; basically as soon as the computer logs in, even when stone cold. Looking around on the forum other people report that this can be hardware or software issue.
Sadly I needed to get the system operational and delivered back to the client so I have not managed to collect information about potential that a specific work unit seems to trigger this but I felt you may find my experience useful.