BTW, do you know how to improve OpenGL performance in wine? I get about 10-30% drop in FPS compared to the Windows version (the card is overclocked about 10% both in CPU and memory frequencies in windows, so that might explains some of the performance drop). I set UseDGA to Y in "wine regedit" but that doesn't seem to help at all.
There are many factors * Overclocking, as you mentioned * Speed of the 3D driver. * Resource usage of background processen * Overhead of Wine of course, but that should be minimal for OpenGL. * and many more
The UseDGA has no influence on this, this affects only 2D acceleration of DirectDraw games.