the highest texture quality on all maps i found that is usable without stuttering is medium with 2gb of video memory, everything else can be on ultra less aa. also anybody with more than 6 cores try limiting this Thread.MaxProcessorCount 6 to 6 or lower. this fixes the infrequent stuttering i was getting. mantle is now really smooth for me and my friends, just sucks you can't yet turn up the textures yet on the 7800/270's the mouse is tighter in mantle compared to dx11 as well. it feels quake-like in its responsiveness .