Nah, 6.5 on both boxes. Slightly older 6.5.12 on Linux and 6.5.19 (the latest 6.5 + compute 5.2 support I think) on Windows. Tried x64 builds too, doesn't seem to make much of a difference either way. Weird shit. I did manage to make the win build a little better by manually unrolling stuff, just looks like the win version of nvcc isn't really trying to figure stuff out itself. Which brings me back to weird shit.