NI does not support the use of third party PCI to PCIe adapters, and does not sell adapters.The use of an adapter can work in some cases, but is generally not recommended, especially with high throughput cards because the adapter may not have the throughput to support the data transfer.
Additionally, some drivers may not work with the adapter, causing PCI cards to not be recognized by the system or behave incorrectly. For our MXI modules, they are PCI-SIG compatible in the back connector directed to the PCIe slot on the motherboard or the PXIe backplane, but the front panel connector does not support this protocol.
What is a PCI Bus and How Does PXI Handle Bus Extension?
Error 10 in Windows Device Manager for MXI Connection
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A valid service agreement may be required, and support options vary by country.