218/250 were fully playable at good framerates (60+). He notes that the more popular a game is the more likely it is to work flawlessly.
Of the remaining 32 games that had problems, 12 of them defaulted to the iGPU on the CPU instead of using the Intel dGPU. He had to disable the iGPU in Device Manager to get them to use the dGPU. 11 of those 12 worked flawlessly after making this change.
5 games crashed on launch (Avatar: FOP, Batman Arkham Knight, Sim City 4, Left 4 Dead 2, Saints Row 2)
6 games ran but with graphical artifacts (Bioshock, Dirt Rally, Ghost of Tsushima, Starfield, GTA4, The Witcher 3)
11 games ran but with poor performance (Starfield, Alan Wake 2, TLOU1, Hellblade 2, Dragon’s Dogma 2, Yakuza Like a Dragon, Metro: Last Light, +4 more not specified).
He also had problems running with multiple monitors.
Older games seem to mostly run fine, newer games seem to be the ones more likely to have problems.