Unity3d is a game engine for casual gaming (not hardcore gaming). They have some good data on their user base's hardware at
http://unity3d.com/webplayer/hwstats e.g. their breakdown of video cards for this quarter is at http://unity3d.com/webplayer/hwstats/pages/web-2008Q4-gfxcard.html Their top 3 graphics cards are Intel 945 (GMA 950) 13.3% Nvidia GeForce 6100 7.5% ATI Radeon X300/X550/Xpress200/1100 6.9% And believe it or not, 8% of their users still only have 256MB of RAM... - Dan
