PCI Express
History and revisions
While in early development, PCIe was initially referred to as HSI (for High Speed Interconnect), and underwent a name change to 3GIO (for 3rd Generation I/O) before finally settling on its PCI-SIG name PCI Express.

PCI Express

Section Title: History and revisions
Table Section Text: While in early development, PCIe was initially referred to as HSI (for High Speed Interconnect), and underwent a name change to 3GIO (for 3rd Generation I/O) before finally settling on its PCI-SIG name PCI Express.

PCI Express version	Introduced	Line code	Transfer rate	Throughput

×1	×2	×4	×8	×16

1.0	2003	8b/10b	2.5 GT/s	250 MB/s	0.50 GB/s	1.0 GB/s	2.0 GB/s	4.0 GB/s

2.0	2007	8b/10b	5.0 GT/s	500 MB/s	1.0 GB/s	2.0 GB/s	4.0 GB/s	8.0 GB/s

3.0	2010	128b/130b	8.0 GT/s	984.6 MB/s	1.97 GB/s	3.94 GB/s	7.88 GB/s	15.8 GB/s

4.0	2017	128b/130b	16.0 GT/s	1969 MB/s	3.94 GB/s	7.88 GB/s	15.75 GB/s	31.5 GB/s

5.0	expected in Q1 2019	128b/130b	32.0 GT/s	3938 MB/s	7.88 GB/s	15.75 GB/s	31.51 GB/s	63.0 GB/s

Sentence(s)

PCI Express 3.0 upgrades the encoding scheme to 128b/130b from the previous 8b/10b encoding.

final_sentence: PCI Express 3.0 upgrades the encoding scheme to 128b/130b from the previous 8b/10b encoding.