Hi Pdupre,
Our 843x serial boards will run as specified under non-realtime systems. The note on the NI serial 3.0 readme means that these boards are now supported by the NI serial drivers. In summary, our 843x serial boards will run at the full advertised speed on both RT and non-RT systems.
I hope this answers your questions, please post back otherwise!
Best regards,
Tom
Applications Engineering, NI UK