[Warp]

In my experience, the NVidia 6800 runs very speedily with 16 bit float, almost as fast as 8 bit. 32 bit is fair bit slower than 16 on the 6800.
All ATI cards run a lot slower in 16 bit or 32 bit float than in 8 bit.

If you’re doing work in float, I strongly recommend a 6800 and running in 16 bit.

Warp