Thanks for the reply - it's as follows: (from memory)
The PC is basically about 10 months old but the GPU is less than a month old.
- Mobo: Z87 Fatality Killer
- CPU: Intel I5
- DRAM: Corsair 8GB RAM
- GPU: (brand new) EVGA GTX1080 FTW (self-installed)
- PSU: SEASONIC 600W PSU
The PC has never done this before installing the 1080. It was working fine for the first 2 weeks with my new GPU. The sudden reset only started less than a week ago after I was running the card after 10+ days, and ONLY when I'm on HOTS. Before that no problem at all.
I installed the EVGA fan control software and set the fan speed to permanently 70% and kept an eye on the temp - it seems to be aaround 39C when idle and starting the game it goes to about 45C. It still resets suddenly.
The GPU also pretty much has an air-con blowing directly at it from about 2m (6 ft) away. Thanks in advance.