Hi KP,
Thanks for your interest in the NI 655X. These products use a brand new driver, NI-HSDIO, which is based on DAQmx. We are still working on a more bandwidth-efficient web installer for the driver, but for now I have placed it on our temporary ftp site. You can find it at ftp://ftp.ni.com/incoming/HSDIO.zip
This driver contains a full set of example programs for both LabVIEW and CVI, and the help files are a great way to learn about the physical capability of the board.
Do you have any other questions about these products?