My PC : Radeon 9000 128 VRAM, Athlon XP 1800+ @ 2015 GHz, 256 DDRam. OK here are my resoults:
Marvel VS Capcom 2 - 40~44/60 fps during gameplay, some minior graphic errors (the backgrund sprites cover sometimes character sprites when jumping, both are unfiltered), fully playable.
Resident Evil : Code Veronica - 25~33/30 fps during gameplay (when more objects appear on the screen it goes down to 19), some minior graphic errors in the subscreen, ocasionaly crashes makes it unplayable :/.
Sonic Adventure 2 - 19~35/60 fps fps during gameplay, minior graphic errors (some strange texture errors most likely coused by ma old Radeon), unplayable - hangs after compleating 1st stage as Vilains and Heroes.
Soul Calibur - doesn't boot.
Sword Of The Berserk - 25~32/30 fps during gameplay, fully playable.
Please post some of Your resoults

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EDIT: Sword of the Berserk is unplayable

(hangs after 1st boss battle)
All games work with full compatible sound.