The PCIe standard uses GT/s: https://pcisig.com/specifications/pcie-70-specification-version-03-now-available-members https://pcisig.com/specifications/pcie-70-

The PCIe standard uses GT/s: https://pcisig.com/specifications/pcie-70-specification-version-03-now-available-members https://pcisig.com/specifications/pcie-70-specification-vers... This is not the same as Gb/s. There's a few percentage points difference due to error correction.