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DAQmx logging onboard device memory overflow

I am trying to log externally clocked data at 40.92Mhz on a PCIe 65378 bus on windows XP.  I am logging 4, 8 bit ports (32 bits per sample).

 

I am using the DAQmx configure logging function using continuous samples.

 

I can log two ports at this rate with no problems.  When I add the additional two ports that I need, I reach a buffer overflow:

Error 200361: Onboard device memory overflow. [...] Reduce your sample rate

 

Is there any way I can configure the DAQ to meet this throughput requirement, or am I hitting a hardware limit?  I previously asked about this problem here and was advised to use the DAQmx configure logging instead of my produce/consumer design.

https://forums.ni.com/t5/LabVIEW/producer-consumer-memory-overflow/m-p/3187148

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I misread the bus.  It is a PCIe 6537B

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