What The Heck Is Up With Higher Resolutions W/OGL On My G400?

[Punchdog]

OK, I finally got my G400 Max working with Quake 2 & 3 in OpenGL. BUT, as soon as I try to go over 800 X 600, it freezes about 2 minutes into game play! What the hell's going on?

Asus P3B-F
Matrox G400 Max
Pentium 3 550
256 megs RAM