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Thank you for contacting Intel® Communities Support.
I am glad to assist you, please provide us the following information to check your system configuration.
Please provide us the Intel® System Support Utility for Windows* report.
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I hope to hear from you soon.
I was looking for a new computer to buy.
Sorry for the inconvenience, I have found the answer in a document that the PCIe bus of Xeon® Gold 6128 can be configured with at least one port 16x Gen3.
Then this ticket can be closed.