Chapter 2 Device Overview
NI 660x User Manual 2-8 ni.com
Transfer Rates
The maximum sustainable transfer rate a TIO device can achieve for a
buffered acquisition depends on the following factors:
• Amount of available bus bandwidth
• Processor speed and operating system
• Application software
To reduce the amount of bus activity, limit the number of devices
generating bus cycles. Because direct-memory access (DMA) transfers are
faster than interrupt-driven transfers, NI-DAQmx uses DMA by default for
buffered acquisitions.
Note The maximum sustainable transfer rate is always lower than the peak transfer rate.
Table 2-1 lists the maximum transfer rates for TIO devices.
Table 2-1. Maximum Transfer Rates
DMA Interrupt
Finite Operation
Buffer Size (Samples) Rate (kS/s) Buffer Size (Samples) Rate (kS/s)
100 5,000 100 77
1,000 2,150 1,000 77
10,000 1,600 10,000 77
100,000 1,350 100,000 77
Continuous Operation
Buffer Size (Samples) Rate (kS/s) Buffer Size (Samples) Rate (kS/s)
100 44 100 7
1,000 202 1,000 46
10,000 212 10,000 75
100,000 245 100,000 76
default 212 default 75
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