wikiPCI Express
PCI Express (Peripheral Component Interconnect Express), official abbreviated as PCIe, is a serial expansion bus for the connection of peripheral devices to the cipset of a computer system. PCI replaces the previous expansion standards PCI, PCI-X and AGP.
Function
With PCIe, each peripheral device is connected to the PCIe root complex via its own serial point-to-point connection. In contrast, parallel PCI uses a shared, parallel PCI bus.
A PCIe connection ("link") between a peripheral device and the PCIe root complex can consist of 1 to 32 so-called "lanes."
PCIe standards
| PCIe 1.0/1.1 | PCIe 2.0/2.1 | PCIe 3.0 | PCIe 4.0 | PCIe 5.0 | PCIe 6.0 | PCIe 7.0 | |
|---|---|---|---|---|---|---|---|
| transfers/s | 2,5 GT/s | 5 GT/s | 8 GT/s | 16 GT/s | 32 GT/s | 64 GT/s | 128 GT/s |
| codation | 8b10b | 8b10b | 128b130b | 128b130b | 128b130b | PAM4 | PAM4 |
| bandwidth at | |||||||
| x1 (25 mm slot length) | 250 MB/s | 500 MB/s | 984,6 MB/s | 1,97 GB/s | 3,94 GB/s | 7,53 GB/s | ca. 16 GB/s |
| x4 (39 mm slot length) | 1 GB/s | 2 GB/s | 3,94 GB/s | 7,88 GB/s | 15,75 GB/s | 30,12 GB/s | ca. 64 GB/s |
| x8 (56 mm slot length) | 2 GB/s | 4 GB/s | 7,88 GB/s | 15,75 GB/s | 31,5 GB/s | 60,24 GB/s | ca. 128 GB/s |
| x16 (89 mm slot length) | 4 GB/s | 8 GB/s | 15,75 GB/s | 31,5 GB/s | 63,0 GB/s | 120,47 GB/s | ca. 256 GB/s |
The dimensions of the x1, x4, x8, and x16 PCIe slots remain the same regardless of the PCIe standard (PCIe 1.0/1.1, PCIe 2.0/2.1, PCIe 3.0).
Both x8 PCIe slots 6 and 7 of the Supermicro X9SCM-F Mainboards are either operated as PCIe 2.0 (for Sandy Bridge CPUs) or as PCIe 3.0 (for Ivy Bridge CPUs) dependent of the used CPU:
More information
- PCI Express (de.wikipedia.org)
- PCI Express (en.wikipedia.org)
- PCI Express Additional Resources (www.pcisig.com)
- PCIe-Roadmap: 5.0-Certification in brief, 6.0 on the home stretch (heise.de, 03.06.2020)
- PCI-SIG Releases 256GBps PCIe 6.0 x16 Spec (servethehome.com, 11.01.2022)
- What features PCIe has? (blog.3mdeb.com, 08.10.2020)
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Author: Werner Fischer Werner Fischer, working in the Knowledge Transfer team at Thomas-Krenn, completed his studies of Computer and Media Security at FH Hagenberg in Austria. He is a regular speaker at many conferences like LinuxTag, OSMC, OSDC, LinuxCon, and author for various IT magazines. In his spare time he enjoys playing the piano and training for a good result at the annual Linz marathon relay.
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Translator: Alina Ranzinger Alina has been working at Thomas-Krenn.AG since 2024. After her training as multilingual business assistant, she got her job as assistant of the Product Management and is responsible for the translation of texts and for the organisation of the department.
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