Games tested-
GLQuake, Quake II, Quake III, Jedi Knight II Outcast, System Shock II, Thief, Half-Life, Descent II & III, Unreal, UT, Deus Ex, Wheel of Time, MDK, NFL Blitz.
Demos tested-
Final Reality, Mark3D99 MAX, Mark3D2000
(work in progress, updating)
To be honest I have forgotten a number of demos and games I have tried, I will rerun tests and post the results.
Half-Life D3D
Quake III with simple cfg, OpenGL wrapper
GLQuake with OpenGL wrapper