So I just set up EmuDeck on the OLED and transfered my Switch games to test them. I started Pokemon Violet and upon loading my save was greeted with a pretty steady 28-30 FPS in an area where I quit the game on my LCD Deck because I wasn’t getting more than 22 FPS at best.
I thought maybe Yuzu recieved an update in the meantime that drastically improved the performance so I also got my LCD Deck and updated it to be on the same SteamOS and Yuzu version with the exact same settings and loaded the save game.
I got 18-19FPS with the CPU only drawing 2W. Turning off SMT via PowerTools got me to 22FPS and 7-8W CPU power.
However with the OLED Deck, it doesn’t make a difference if SMT is on or off, in both cases I get around 9W CPU power draw (while still having ~1W less overall compared to the LCD Deck) and 28-30FPS in that same area.
Zelda TotK got a good boost too, although it’s still not really enjoyable to play on the Deck, but in areas where the LCD Deck still drops to 15-20FPS, the OLED Deck manages to stay above 20.
Xenoblade Chronicles 3 also runs at 27-30FPS so far, the LCD Deck regulary dropped to 25 and below.
SteamOS 3.5, which the OLED ships with, fixed the SMT bug which handicapped performance on the emulators like Yuzu. But this bug is fixed in the OS update now, for any Steam Deck; not just OLED.
Also here is a clip with ToTK gameplay, and you can find the setup guide linked in that video as well. So you may be able to get better performance.
As I said I’ve ran the LCD Deck with the exact same configuration and SteamOS 3.5.7 and the SMT bug is still there