Does NI PXIe-8399 Throughput Depend on its Chassis Backplane?

Updated Aug 15, 2025

Reported In

Hardware

  • PXIe-8399
  • PXIe-1095
  • PXIe-1084

Issue Details

I intends to implement the connection on Figure 1. Using 2 chassis, a PXIe-1095 and a PXIe-1084. If we connect the 1084 as the master, will there be any bandwidth issues/degradation with the x16 MXI express link? Will it be limited by the chassis backplane?

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Does the data coming from the PXIe-1095 will only flow through the PXIe-8399 or will it also pass through the PXIe-1084 backplane affecting the throughput of the system? The module's documentation is unclear about this.

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Solution

In this architecture, the bandwidth of the "Master" chassis backplane does not affect the throughput to the "Slave" chassis. The downstream MXI port on the PXIe-8399 is connected directly to the Gen 3 PCIe switch on that card. 

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