With double-precision on, the benchmark renders slower. Just tried it. not by much, maybe 5-10%? Honestly I have no idea what double-precision is useful for. Anyone can fill me in?
I was also wondering whether it was possible to edit a preferences file allowing AE to use more available VRAM. I understand limiting cards with less memory, but I'm only getting 4.5 GB of usable VRAM with the titan in AE. Granted, that is a lot but it would be great to get another GB and I doubt the OS needs more than 500 mb of overhead.