the 1.08 patch is supposed to fix the issue with cards having more than 512mb of vram

also s'posed to have a combo where you hit shift and - to clear the vram

not sure if those work or not but patch lists them as fixes

* New texture detail "Default" that autodetects the amount of VRAM. Recommended Texture Detail setting for users of cards with more than 512 VRAM.

Fixed: Better VRAM allocation estimations for nVidia 8800 card, resulting in less frequent missing textures.
- New: Cheat Shift+Minus FLUSH to allow to manually flushing all VRAM allocations to restore performance if needed.