GDQ is a huge resource hog, mines set to 9 (because 8 is far to ugly for me with chained armor it just sparkles), my GPU could easily handle GDQ at 10 but my card is only the 1GB version.

There isn't a massive diff between GDQ 8 & 9 just clearer graphics and less jaggies but it requires much more power and Vram to run, on GDQ 8 my card uses 770 mb of Vram in Uldah, at 9 it uses 900mb Vram (thats without AA)