Until the GPL 1.1 patch is released, you really have three options
(listed here in no particular order). Try limiting the card's texture
memory to 2MB or race at 640x480 or try the Banshee/Voodoo3 fix
available here:
http://www.grandprix2.com/gpl/patches/glide2x.zip Again the 1.1 patch
addresses the problem and will make all of these 'fixes' unnecessary.
Eric