What kind of numbers are you looking for? When benchmarking most sites would use a constant, and usually very demanding, set of options for all cards, which will obviously yield unplayable results on GMA 900.
Most games (but for the latest and gratest high end ones) will be perfectly playable at lower settings (as long at you're running dual channel). Go back up to a year to the likes of WoW or Far Cry they'll work but if you have been 'spoiled' by much better desktop graphics you may find the simpler settings (and occational glitch) distracting to the point of hurting gameplay. Go back another year to UT 2003, GTA Vice City, or Jedi Academy, for example, and there will probably not be any problems at all.