Comanche 4
Comanche 4 is a helicopter simulation game that uses DirectX 8. Today's video cards have so much performance that the CPU and memory become the main bottleneck. We used the freely available Comanche 4 demo at 640x480.
Quake 3 Arena
ID Software's
Quake 3 Arena is a fast-paced first person action shooter. The Quake 3 engine has been used in many other game titles like Return to Castle Wolfenstein. We used the included "four" demo with version 1.32 at 640x480 where the CPU and memory bandwidth are the performance limiting factor.