I have a card that ran fine for 3 days with softplaymod 0.9V 1400/1100 but now whenever its on load whether it be mining or a benchmark like furmark it instantly crashes. the GPU tach lights turn off and the fan suddenly seems to run at full speed.

A restart doesnt even fix it. I have to fully shutdown the rig.

Any ideas what could be the cause? I've tried moving slots, risers, PSU, DDU driver uninstall and reinstall, no softplaymod at stock settings and it still happens...