Defy Gravity is awesome indie game, great lvl design, music and gameplay.
Sturmovik is best plane simulation and Audiosurf is fun music arcade combo.
All three working great on GMA 4500MHD

Audiosurf

Running great
FPS 30 stable

Defy Gravity

Runs great
FPS 58-60

IL-2 Sturmovik 1946

Running with no problem.
FPS 28-40