Buffer depth on the USB-6509

Support,

   I did not find the buffer depth listed in the USB-6509 specification. What is the depth of the buffer behind each I/O channel on this instrument. I need to run 96 channels with 500 bits per channel in parallel I want to understand if it will buffer this number of bits from PC to USB to 6509 all at once before the StartTask or will it have to buffer numerous times to complete the 500 parallel bits. I assume if the buffer size is less than 500 bits it would impact execution time since it would have to reload a smaller buffer some number of times to complete the task.

Thanks,

Jack