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The manual suggests it is 4 lanes (PCIe 4.0 x4)The errata states it is an Oculink SFF-8621 physical connector but it is not completely wired for OculinkNonetheless, do the PCIe lanes work sufficiently for an SFF-8621 to U.2 NVMe cable?Here is an example of the cable CBL-SAST-0956 from SupermicroThe cable is not very expensive, I might simply buy one to try it.