Also should point out.
Auto undervolting doesn't seem to do anything other than set the voltages to default for the mode (Balanced, Power Saver, Turbo,...
Auto Memory overclock does seem to do something. It sets Mem frquency from 945 to 1080MHz in Turbo mode, for example. I was running at 1100 anyhow, with a 25 mv undervolt on memory.
I updated to Adrenalin 18.12.3 via incremental update.
I tried the Automatic Overclocking Feature from Balanced Mode with XFX RX Vega 64 Liquid.
Here is what happened.
(1). Black Screen, faint audio buzz.
(2). System hang.
(3). Power Button unresponsive.
(4). I had to press hard reset on my PC.
(5). Windows 10 64bit would attempt to reboot but thjen immediatly black screen and system freeze after birefly showing the Windows 10 login screen - so it looks like the 'Auto Overclock' was applied.
(6). I had to press hard reset on my PC.
(7). I tried to boot into safe mode by holding F8 on reboot - but failed. These days only reliable way to get into safe mode is get into Windows 10 OS in first place. Even Windows 10 recovery disks don't help.
(8). This time safe mode was not entered, Windows 10 64 bit attempted to start and then I had VGA Err LED flash up on the Asus Z97 Motherboard for GPU 1. Thgis
(7). I removed both the Primary RTX 2080 GPU1 and the Secondary XFX RX Vega 64 Liquid GPU2 from the PC.
(8). I was unable to get the PC to boot at all.
(9). I reflashed the Motherboard Bios.
(10). I booted into another emergency backup copy of Windows and then ran windows disck checks on the original Windows 10 installation.
(11). I booted into the original Windows 10 installation, using the intel iGPU to display output.
(12). I uninstalled AMD Driver by removing internet connection and booting into Safe Mode from Windows 10. I will reinstall the Nvidia and AMD GPU's next.
After this I suggest AMD remove this Auto Overclocking feature until it is safe to use. It is clearly completely broken if it is causing issues like this.
Quick Video from smart phone showing what happens when I apply AMD Adrenalin 2019 version 18.12.3 Automatic Overclock from Balanced mode on RX Vega 64 Liquid shown here: AMD Adrenalin 2019 18.12.3 Automatic Overclock on RX Vega 64 Liquid = Black Screen & System hang. - YouTube
I am lucky I got my Windows 10 64 bit OS back in this instance. I had to reflash Motherboard BIOS as well in this case. I do not want to repeat this test again until AMD fix it. I think you should pull automatic GPU overclocking feature from the drivers for RX Vega 64 Liquid it is so bad.