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pci 6120 can't reach 800ks/sec using Nidaq function calls

I am programming on the PCI-6120 board using CVI and nidaq scan functions. If I put in a scan rate more than 760khz, the scan function returns an error code, telling me that my scan rate has exceeded the hardware capabilities. So what's the problems here? This board suppose to be able to working at 800ks/s, and I did achieve such sampling rate using Labview on a 4 board configuration.
I would also like to know how to utilize the onboard memory buffers, or this has already been taken care of in the Nidaq function library?
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Unfortunately, only LabVIEW can utilize the NI 6115 and NI 6120 onboard memory to store acquisition data for later retrieval. There is a knowledge base that talks about this in more detail.

http://digital.ni.com/public.nsf/websearch/9C419710B6071A6D86256BD600624B83?OpenDocument

We are considering this, but I cannot give a date when this will be possible. Look for it in a future release of NI-DAQ (possibly). I hope this clears up the confusion.

Josh
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The link URL above is incorrect. The correct link is:

KnowledgeBase 2MBBRQB5: How Do I Use the NI 6115 and NI 6120 Onboard Memory to Store Acquisition Dat...
(http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/30326d1ad48d86e086256e8e00245e48?OpenDocument)

mj
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