Here is a list of some games I already tested
(not overclocked):

Alundra 2 - works - very slow
Alundra - works - a little slow
Brave Fencer Musashi - works - very slow
Breath of Fire 3 - works good
Bushido Blade - cant start
Castlevania - works, a little slow
Chrono Cross - cant start
Cool Boarders 2 - works - not fullspeed and music dont works
Crash Bandicoot - cant start
Deathtrap Dungeon - cant start
Diablo - nearly fullspeed
FF7 - neaerly fullspeed but sound is not perfect
FF8 - cant start
Frogger - nearly fullspeed
G-Darius - fullspeed
Gex 1 - nearly fullspeed and sound is cheap
GTA 1 - nearly fullspeed
Heart of Darkness - cant start
Klonoa - works but slow
Kula World - nearly fullspeed
Legend of Mana - cant start
Pandemonium - cant start
Quake 2 - works but very slow
RPG Maker - works fullspeed
Tekken 1 - works but very slow
Tekken 2 - works but very slow + bug with spikes ingame
Tekken 3 - cant start
Theme Park - fullspeed, but I cant read the text
Tomba! 1 - works perfect until you want to move the character
Tomba! 2 - works, slow
Tomb Raider 1 - Menu works but crashes after i want start new game
Tomb Raider 2 - wont start
Vagrant Story - cant start??
worms world party - nearly fullspeed but laggy