I think I've found the issue, I took the heatsink off to reseat the fan plug, replaced the thermal paste whilst I was at it. I noticed the fan closest to the ports wasn't as smooth as the others, it...

Yeah they've been running fine for ages, have added specs

OK that didn't work, the fans speed up as soon as the driver is installed.
Perhaps it's something to do with having a 1080 and a 970 in the same machine? I'm out of ideas

Right so I've done a clean install of the GPU drivers as well as a clean install of MSI AB with deleting the profile. Same issue.

It seems when I booted into safe mode the fans were at normal...

Normal temps, 30s idle, 70 under load which is what I set the limit to. I tried updating the drivers but I'll give a clean install a shot with DDU.

Hello I don't have automatic fan control enabled, It's a bitcoin mining machine so I set the number manually.

No idea what's caused this, turned my machine on one day and noticed the fans were louder than usual.
They spin up as soon as I get to the login screen for windows.
I've been using MSI Afterburner...

Hello thanks for the info! I lowered my overclock significantly on the cpu and haven't seen a crash since, sounds like it was a bad overclock. Thank you!

Blue screen varies, 'uncorrectable error' was one. Seems to have started happening since I physically moved my machine over to a friends house.
I use this machine for mining bitcoin, often I'll...