Cannot get high transfer rates with PCI-6534

I am using a PCI-6534 in the Pattern I/O mode for performing data acquisition. The data rate I am getting for reliable data is about 2MS/s. I need 8MS/s, but do not get reliable or correct data at this rate. According to the 653X User Manual the benchmarked rate is 20MS/s, but I seem to be getting nowhere near this.

How is your memory?
http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/101ad216bd2b692286256a48006a986c?OpenDocument
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
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