In this context, a transfer is almost the same thing as a bit. For each 8 bits o...

21 on June 10, 2017 | parent | context | favorite | on: PCIe 4.0 will be twice as fast as today's slots

In this context, a transfer is almost the same thing as a bit. For each 8 bits of useful payload PCIe sends 10 bits of encoded payload. The GT counts the total number of sent bits, which include this 20% overhead. So actual userful bitrate is 0.8 * GT.

shaklee3 on June 10, 2017 [–]

That's true for pcie 2. Pcie 3 is 128/130b encoding, so it's much, much more efficient.