PCI-6521 Benchmarks with NI-DAQmx
Primary Software: LabVIEW Development Systems>>Professional Development System
Primary Software Version: 8.0
Primary Software Fixed Version: N/A
Secondary Software: N/A
Hardware: Digital I/O (DIO)>>Isolated>>PCI-6521
Problem: What are the benchmarks for the PCI-6521?
Solution: The data transfer rates of the NI 6521 are software timed, also called unstrobed or nonlatched, and do not require status and control signals so the transfer speed are completely software/computer dependant. These rates may vary due to programming language and code efficiency, CPU utilization, transfer methods, and so on.
Below are the results of benchmark testing for the PCI-6521 based on 10,000 updates. All tests were executed without software delays or data verification; generated values were toggled each iteration. Attached are the VI's used to obtain these results.
| Hardware Setup |
| Device Type |
Model |
Kit Part Number |
Assembly Part Number |
| Digital I/O Device |
PCI-6521 |
779312-01 |
192323B-01 |
| Computer Specifications |
|
Computer 1 |
Computer 2 |
| Operating System |
Windows XP Professional
Service Pack 2 |
Window XP Professional
Service Pack 2 |
| Model |
DELL OptiPlex GX280 |
DELL OptiPlex GX150 |
| Processor Speed |
3.2 GHz |
1 GHz |
| RAM |
1 GB |
256 MB |
| Bus Chipset |
Intel 915G Express Chipset
800 MHz Front Side Bus |
Intel 815E Chipset
133 MHz Front Side Bus |
| HD Access Rate |
ATA 100
7200 RPM |
ATA 100
7200 RPM |
| LabVIEW Version |
8.0 Released |
8.0 Released |
| Acquire 1 Channel |
| Measurement |
Results Computer 1 |
Results Computer 2 |
| Total Time Elapsed |
97.2 ms |
118.2 ms |
| Average Update Rate |
102885 Hz |
53154 Hz |
| Average Update Interval |
9.70 µs |
11.8 µs |
| Acquire 1 Port (8 Channels) |
| Measurement |
Results Computer 1 |
Results Computer 2 |
| Total Time Elapsed |
109.0 ms |
211.2 ms |
| Average Update Rate |
91749 Hz |
47352 Hz |
| Average Update Interval |
10.9 µs |
21.1 µs |
| Acquire All Channels (8 Channels) |
| Measurement |
Results Computer 1 |
Results Computer 2 |
| Total Time Elapsed |
115.7 ms |
217.7 ms |
| Average Update Rate |
86453 Hz |
45951 Hz |
| Average Update Interval |
11.6 µs |
21.8 µs |
| Update 1 Channel |
| Measurement |
Results Computer 1 |
Results Computer 2 |
| Total Time Elapsed |
90.7 ms |
190.4 ms |
| Average Update Rate |
110259 Hz |
52523 Hz |
| Average Update Interval |
9.10 µs |
19.0 µs |
| Update 1 Port (8 Channels) |
| Measurement |
Results Computer 1 |
Results Computer 2 |
| Total Time Elapsed |
86.2 ms |
184.1 ms |
| Average Update Rate |
116015 Hz |
54324 Hz |
| Average Update Interval |
8.60 µs |
18.4 µs |
| Update All Channels (8 Channels) |
| Measurement |
Results Computer 1 |
Results Computer 2 |
| Total Time Elapsed |
111.1 ms |
214.2 ms |
| Average Update Rate |
94359 Hz |
46715 Hz |
| Average Update Interval |
11.1 µs |
21.4 µs |
Related Links: Products and Services: PCI-6521Digital I/O Help for 6509/651x/6520/6521/6528 Devices (User Manual and Specifications)Complete Industrial Digital I/O and Counter/Timer Tutorial
Attachments: 
Report Date: 11/21/2005
Last Updated: 07/23/2007
Document ID: 3RK9PBX6
