It's probably recognizing all your memory. See bridgman's explanation here: http://phoronix.com/forums/showthread.php?26231-r600-uses-only-256-mb-video-ram
It's probably recognizing all your memory. See bridgman's explanation here: http:// phoronix. com/forums/ showthread. php?26231- r600-uses- only-256- mb-video- ram