I have tested these games my self:

Batman & Robin: gets in to game but controls lose somewhere... otherwise seems to work well.

Colin McRae Rally: Works well until you play i little, then game crashes.

Dune 2000: You get in to menu what starts to blink, and you cant get forward.

Diablo: Crashes befor getting in menu.

Need for Speed 2: Just closes PSX4ALL.

G-Police: Just closes PSX4ALL.

Star Wars Episode 1 The Phantom Menace: Stays at the Loading Bios screen and tilts.

Resident Evil 1: Stays just in Loading Bios screen.

Resident Evil 2: Nothing happens after Loading Bios screen.

Resident Evil 3: Stays just in the starting screen.

Blade: You het in the loading screen, where the blade is rounding, but then nothing.

Silent Hill: You get in to game, but after walking a little, game tilts. There are some graphical bugs, but game otherwise would be playable.

Spawn: Stops in to games loading screen.

Spider-Man 1: Menus and loading screen seems to work in right speed, but game is a bit slow, but still seems to work.

Spider-Man 2: And same thing here, menus and loading screen seems to work in right speed, but game is a bit slow, but still seems to work.

Tekken 2: works but very bad graphical issues...