Takes some tweaks to play the best games.
Simply put type GMA900 into google and check out some reviews. Type in GMA950 to see what replaced it and some more current games.
Extremtech has done a review of both.
Simply put, low frame rates turn everything down and you might get 10-15 fps at 640x480 in modern 3D games.
I did see someone get Oblivion working on a GMA 950 over at elderscrolls.com though;http://www.elderscrolls.com/forums/index.php?showtopic=337851
And that chip isn't even supported, but thanks to some shader replacement mods it works, but still poorly.