The 16 pipelines have 16bit or 32bit formats for the texture pipelines.
Also, the system uses 64 bit filtering for the system.
Even better, on the tech specs, they specify:
Full 128-bit studio-quality, floating point precision through the entire rendering pipeline with native hardware support for 32bpp, 64bpp, and 128bpp rendering modes
Amazing!
Check out the page on the filtering effects.
Incredible!