Following the computation on total memory used, what is the reason that not even half of the memory available on the Titan is being used? Up until the last release today (4/14) autotune has always picked a configuration of 300-307x2 (now 263x2) which comes out to about 2.5GB of used memory at most. Since scrypt is a space/computation tradeoff algorithm isn't there potential for almost a doubling in hash performance if the full 6GB could be used?

Btw, the lastest work has been fantastic. My card hashes at a much more consistent rate and about 30khash/s more than previous builds. Fixing the Ctrl-C is just a nice usability improvement.