Update to all that are watching this thread: We were able to improve the performance on the motherboard we tested. The change is in DAQmx 9.0. I say improve rather than fix becuase while I can achieve max rates in LabVIEW and CVI, I can't achieve them in test panels (I haven't had a chance to dig through that code to figure out why). Also, we were not able to test all the motherboards listed so please let us know if you are still seeing the behavior.
Thanks,
Andrew S
MIO DAQ PSE