Install the software on your ROG Ally. A shortcut to the app should be on your desktop after the installation is complete.
Open up Universal x86 Tuning Utility.
There’s two sections in the app. Settings let’s you change Wifi, Bluetooth, Brightness, Volume, your Operating Mode, Switch from Controller to Mouse Input, enable Start on Boot and Start Minimized.
The Advanced section let’s you adjust Temperature Limit for CPU/APU, change your TDP, control CPU/APU voltage, control Max CPU Clock, control Max CPU count, Adjust Framerate Limit and enable/disable AMD RSR.
ETA Prime did a video on it.
This Performance Tweaking Tool for The Rog Ally & Other X86 Hand-Helds Is Amazing