The OpenGL driver from S3 is not so bad as the Doom 3 results may suggest. In Quake 4, which is an OpenGL application too, the Chrome S27 is no worse than the GeForce 6600, especially in higher resolutions. However it is only in 1024x768 that we have a comfortable frame rate.
Serious Sam 2
Graphics cards without Shader Model 3.0 support are always slower in Serious Sam 2 than cards that can process such shaders. Moreover, the game is very difficult even by today’s standards, so you will have to reduce the resolution to 800x600 to play it on an entry-level graphics card, if you don’t want to reduce the level of detail instead. The game runs more or less smoothly only on the GeForce 6600 GDDR2, yet there’s still no talk about comfortable play.