I’ve experienced random stuff like that in past - not exactly the same though and not that chip.
I’d suspect power issue, either cpu and/or gpu causing a spike that results in some voltage rail to go unstable. More likely GPU, unless your applications are really thrashing all cpu cores.
How old PSU? how much headroom? how good brand of PSU? Might also be a motherboard power management issue.
Also - it might not hurt just to unplug and reseat every power cable.






That PSU sounds good enough to me.
Could be worth a motherboard firmware update?
and i would double check all the power cables.
It looks ike mangohud is an application to monitor stuff. I’ve never used it but you could give that a go - see if you’re ever getting close to the 750W.