=== PCI Express througput speed ===

^  Version  ^  Year  ^  Transfer rate  ^  Throughput  ^^^^|
| ::: | ::: | ::: ^  x1  ^  x2  ^  x4  ^  x8  ^  x16  |
|  1.0  |2003  |  2.5 GT/s|0.250 GB/s|  0.500 GB/s|  1.000 GB/s|  2.000 GB/s|  4.000 GB/s|
|  2.0  |2007  |  5.0 GT/s|0.500 GB/s|  1.000 GB/s|  2.000 GB/s|  4.000 GB/s|  8.000 GB/s|
|  3.0  |2010  |  8.0 GT/s|0.985 GB/s|  1.969 GB/s|  3.938 GB/s|  7.877 GB/s|  15.754 GB/s|
|  4.0  |2017  |  16 GT/s|1.969 GB/s|  3.938 GB/s|  7.877 GB/s|  15.754 GB/s|  31.508 GB/s|
|  5.0  |2019  |  32 GT/s|3.938 GB/s|  7.877 GB/s|15.754 GB/s|  31.508 GB/s|  63.015 GB/s|
|  6.0  |2021  |  64 GT/s|7.877 GB/s|15.754 GB/s|31.508 GB/s|  63.015 GB/s|  126.03 GB/s|

GT/s -> Gigatransfers per second ; GB/s -> Gigabytes per second