Overclock Your GameCube Controller Adapter on Steam Deck

Finally, an easy way of doing it, and stays consistent across reboots too!
Turn Your Steam Deck OLED Into a Buttery-Smooth 120 Hz Machine With This Script

LCD models are also compatible with this script to run at 70 Hz.
No, You Can’t Upgrade the LCD Steam Deck with an OLED Panel

You can’t upgrade to the 50 Wh battery either.
SteamOS 3.5.5: The Biggest Steam Deck Update of the Year!

Display color adjustments, HDR, VRR, undervolting controls, updated Arch base…
Steam Deck Client Update Adds Visual Tweaks to UI, HDR Badges for Supported Games

Plus easier toggling of Steam Input being on or off.
Steam Deck Client Update Allows You to See Shader Cache Size, Adds Low Latency Option for Streaming

Plus support for the PowerA Switch Nano gamepad.
Tony Hawk’s Pro Skater 1 + 2 Gets Offline Fix - But Only for Steam Deck

Might work on desktop with -steamdeck launch parameter though.
Undervolting the Steam Deck: Is It Worth It?

Are there actually benefits to APU temps and battery life?