T kernel in Windows on my Titan is very unstable during autotune unfortunately anything that allocates more then 3GB of VRAM just crashes Cudaminer outright. Not sure what direct limitation is causing this but this is a consistent observation with several hours of manual configurations.
1. Any idea why there would be this limitation in the T kernel for Scrypt-Jane? If I set to autotune Cudaminer instantly takes up 5.5GB of VRAM but once it begins testing any config that would result in > 3GB to be allocated the autotune crashes out. Any manual settings to allocate more then 3GB falls under the same issue.
After a quick search it seems that Titans tend to have issues with memory allocation. Allocating more than 3 GB could lead to all kinds of issues (missing textures in games, crashes, significant memory performance drops, etc). It's almost as if it had 2 x 3 GB ram, but it's a single GPU card..