One thing people do have to realize is that if you use a lossless algorithm such as ours (lossy ones can only degrade quality), the memory used by the back buffer can be quite large. At 1600x1200 with 6xAA, our buffer consumption is over 100 MBs of local memory space. Going to 8xAA would have blown passed 128MB. Consequently, with a lossless algorithm, the increase in subsamples must be matched with algorithm changes or with larger local storage.