As far as i know this driver does not work on Win 7.

It does work on Win 10 for RX580's. Just dont patch the driver with pixel patcher on 580's.
I used AB 4.4.0 Beta 16, works for OC settings. It however does not seem to undervolt card.
Also do not set your OC settings in the Claymore Batch file. does not work. The Driver changed the ADL API so would need an update for Claymore to fix this.
I used Global Wattman that comes with driver. Manually setting Voltage to 990mV and apply, it applies it but sometimes just reverts back to higher voltage later. Just set it back to Auto and apply then my voltage goes to 990mV again. (i do this while claymore is running)
Not even AMD software is properly controlling the Voltage..... tisk tisk AMD!
When you apply the pixel patcher and OC from the claymore batch file you get your mem clock jumping between 2150 and 1000MHz the whole time.
EVen GPU-z is reading GPU load incorrectly at 16% and mem controller 100% when it should be idle. HWinfo64 seems to read the GPU load correctly.

Managed to get my card stable at 30.5MH/s (MSI RX580 Armor 8GB) 990mV, 1250 GPU core, 2150 Mem clocks. Drawing under 100W running at 59-61C Temps. Happy will settle for that.
If running other AMD cards in the machine, and settings dont apply to others it could be because the are running headless. Might need to plug in a dummy plug into cards to make it think it has monitor connected. i know this works. Have found this with Nvidia mixed with AMD machines.
All Nvidia no problem.

AMD wont update driver again, so Claymore will hopefully soon update to fix OC and undervolt issues directly from the Miner batch file.