OSS -PCIe-HIB616-x16 Manual page 36

To check on the PCIe Gen speed and Link Width
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#lspci –nvvs b8:00.00 | grep 'LnkCap\|LnkSta'
To display more details or information
Use command lspci -nvvs 1e:00.0. You can change the 1e:00.0 to whatever the PCI Device number in your system.
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#lspci -nvvs 1e:00.0
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HIB616x16 (Rev B) |36