Maximum Throughput of a PXI System

Updated Jun 5, 2018

Reported In

Hardware

  • PXIe-1085
  • PXIe-8880

Issue Details

What is the maximum capacity/throughput of my PXI system?

Solution

For PXI systems the maximum sustainable data throughput is 110MB/s. However, streaming from RAM to peripherals can cause a drop in throughput of 20% to 40% per bridge.

 

For PXI Express systems the maximum throughput is limited by the number of links in the chassis and controller. For example, if your system has a PXIe-1085 24 GB/s chassis and a PXIe-8880 controller, the maximum data throughput will be 24 GB/s.

 

As you can see in the image bellow, the chassis backplane has one x16 Gen 3 and one x8 Gen 3 links to communicate the peripherals with the controller.  The x16 Gen 3 link contributes with a throughput of 16 GB/s and the x8 Gen 3 contributes with 8 GB/s for a total throughput of 24 GB/s.

 

 

 

The PXIe-8880 controller has two PXI Express Link configuration, one of them has a x8 Gen 3 link and a x16 Gen 3 link for a total throughput of 24 GB/s. This match with the chassis throughput allowing a maximum throughput of 24 GB/s.

 

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