Use the DAQmx Buffer properties to configure input and output buffers in computer memory and to query the size of device onboard buffers.

Input:Buffer Size
Specifies the number of samples the input buffer can hold for each channel in the task. Zero indicates to allocate no buffer. Use a buffer size of 0 to perform a hardware-timed operation without using a buffer. Setting this property overrides the automatic input buffer allocation that NI-DAQmx performs.
Input:Onboard Buffer Size
Indicates in samples per channel the size of the onboard input buffer of the device.
Output:Buffer Size
Specifies the number of samples the output buffer can hold for each channel in the task. Zero indicates to allocate no buffer. Use a buffer size of 0 to perform a hardware-timed operation without using a buffer. Setting this property overrides the automatic output buffer allocation that NI-DAQmx performs.
Output:Onboard Buffer Size
Specifies in samples per channel the size of the onboard output buffer of the device.

NI-DAQmx VI and Function Reference

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