Originally Posted by jAkUp
Its really not. doom3 uses an amazingly low amount of texture memory for what it does. Becuase the High quality runs great on a 128mb card, and they are not even compressing textures!
High quality compresses the specular and bump maps. A surface in Doom 3 requires 3 times as much texture data as it would in most other games because every surface has a texture, bump and specular map. Your judging the amount of texture data just from the regular normal maps. Try disabling bump and specular maps and see how much texture data is REALLY there.