Edit: Yup, the Win7Pro factory image works just fine and the fan noise is acceptable. Now to figure out Windows 10...
Edit 2: Nope, Windows 7 Pro factory image is just as bad. I've left Windows to settle for about 10 minutes now after install, Task Manager says CPU is at 0%, Power Plan Extension still doesn't do anything while selecting Standard or Low Speed for fan control. The fan only throttled during installation, no network services have been activated so it's not like any updates are going on.






