Editing PCI Express (section)

=== Comparison table ===
{| class="wikitable" style="text-align:right"
|+ PCI Express link performance<ref name="faq4" /><ref name="faq3" />
|- style="line-height:120%"
! scope="col" rowspan=2 | Version
! scope="col" rowspan=2 | Intro-<br />duced
! scope="col" rowspan=2 colspan=2 | Line code
! scope="col" rowspan=2 | Transfer rate<br />(per lane){{Efn-lr|name="both-directions"|In each direction (each lane is a dual simplex channel).}}{{Efn-lr|name="transfer-rate"|Transfer rate refers to the encoded serial bit rate; 2.5 GT/s means 2.5&nbsp;Gbit/s serial data rate.}}
! scope="col" colspan=5 | Throughput{{Efn-lr|name="both-directions"}}{{Efn-lr|name="throughput"|Throughput indicates the usable bandwidth (i.e. only including the payload, not the 8b/10b, 128b/130b, or 242B/256B encoding overhead). The PCIe 1.0 transfer rate of 2.5&nbsp;GT/s per lane means a 2.5&nbsp;Gbit/s serial bit rate; after applying a 8b/10b encoding, this corresponds to a useful throughput of 2.0&nbsp;Gbit/s &#61; 250&nbsp;MB/s.}}
|-
! scope="col" | ×1
! scope="col" | ×2
! scope="col" | ×4
! scope="col" | ×8
! scope="col" | ×16
|-
! scope="row" | 1.0
| 2003
| rowspan=5 | [[Non-return-to-zero|NRZ]]
| rowspan=2 | [[8b/10b]]
| {{Nowrap|2.5 [[GT/s]]}}
| {{Nowrap|0.250 [[GB/s]]}}
| {{COther|{{Nowrap|0.500 GB/s}}|align=right}}
| {{Nowrap|1.000 GB/s}}
| {{COther|{{Nowrap|2.000 GB/s}}|align=right}}
| {{Nowrap|4.000 GB/s}}
|-
! scope="row" | 2.0
| 2007
| {{Nowrap|5.0 GT/s}}
| {{COther|{{Nowrap|0.500 GB/s}}|align=right}}
| {{Nowrap|1.000 GB/s}}
| {{COther|{{Nowrap|2.000 GB/s}}|align=right}}
| {{Nowrap|4.000 GB/s}}
| {{CNone|{{Nowrap|8.000 GB/s}}|align=right}}
|-
! scope="row" | 3.0
| 2010
| rowspan=3 | [[128b/130b]]
| {{Nowrap|8.0 GT/s}}
| {{Nowrap|0.985 GB/s}}
| {{COther|{{Nowrap|1.969 GB/s}}|align=right}}
| {{Nowrap|3.938 GB/s}}
| {{CNone|{{Nowrap|{{0|0}}7.877 GB/s}}|align=right}}
| {{Nowrap|15.754 GB/s}}
|-
! scope="row" | 4.0
| 2017
| {{Nowrap|16.0 GT/s}}
| {{COther|{{Nowrap|1.969 GB/s}}|align=right}}
| {{Nowrap|3.938 GB/s}}
| {{CNone|{{Nowrap|{{0|0}}7.877 GB/s}}|align=right}}
| {{Nowrap|15.754 GB/s}}
| {{CNone|{{Nowrap|{{0|0}}31.508 GB/s}}|align=right}}
|-
! scope="row" | 5.0
| 2019
| {{Nowrap|32.0 GT/s}}
| {{Nowrap|3.938 GB/s}}
| {{CNone|{{Nowrap|{{0|0}}7.877 GB/s}}|align=right}}
| {{Nowrap|15.754 GB/s}}
| {{CNone|{{Nowrap|31.508 GB/s}}|align=right}}
| {{Nowrap|63.015 GB/s}}
|-
! scope="row" | 6.0 
| 2022
| rowspan=2 | {{Nowrap|[[PAM-4]]}}<br />[[Forward error correction|FEC]]
| rowspan=2 | 1b/1b<br />242B/256B [[Flit (computer networking)|FLIT]]
| {{Nowrap|64.0 GT/s}}<br />{{Nowrap|32.0 G[[Baud|Bd]]}}
| {{CNone|{{Nowrap|7.563 GB/s}}|align=right}}
| {{Nowrap|15.125 GB/s}}
| {{CNone|{{Nowrap|30.250 GB/s}}|align=right}}
| {{Nowrap|60.500 GB/s}}
| {{CNone|{{Nowrap|121.000 GB/s}}|align=right}}
|-
! scope="row" | 7.0 
| 2025<br />(planned)
| {{Nowrap|128.0 GT/s}}<br />{{Nowrap|64.0 GBd}}
| {{Nowrap|15.125 GB/s}}
| {{CNone|{{Nowrap|30.250 GB/s}}|align=right}}
| {{Nowrap|60.500 GB/s}}
| {{CNone|{{Nowrap|121.000 GB/s}}|align=right}}
| {{Nowrap|242.000 GB/s}}
|}

; Notes
{{Notelist-lr}}