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PCI Express External Cabling (also known as External PCI Express, Cabled PCI Express, or ePCIe) specifications were released by the PCI-SIG in February 2007. [49] [50] Standard cables and connectors have been defined for x1, x4, x8, and x16 link widths, with a transfer rate of 250 MB/s per lane.
The PCI/104-Express specification establishes a standard to use the high-speed PCI Express bus in embedded applications. [1] It was developed by the PC/104 Consortium and adopted by member vote in March 2008. PCI Express was chosen because of its market adoption, performance, scalability, and growing silicon availability worldwide.
Four PCIe 2.0 x16 AMD 970 chipset RX980 Q2 2011 Bulldozer, Piledriver Phenom II, Athlon II, Sempron, FX 65 2400 (HT 3.0) Yes [8] No x16 + x4 No 13.6 SB710, SB750, SB810, SB850, SB920, SB950 Single PCIe 2.0 x16, IOMMU. AM3+ socket support AMD 990X chipset RD980 2600 (HT 3.0) x8 + x8 x8 + x8 14 Two PCIe 2.0 x16, IOMMU. AM3+ socket support AMD ...
PCI Express 5.0 (×16 link) [40] 512 Gbit/s: 63.02 GB/s: 2019 NVLink 1.0: 640 Gbit/s: 80 GB/s: 2016 PCI Express 6.0 (×16 link) [41] 968 Gbit/s: 121 GB/s: 2022 CXL Specification 3.0 & 3.1 (×16 link) 968 Gbit/s: 121 GB/s: 2022, 2023 NVLink 2.0: 1.2 Tbit/s: 150 GB/s: 2017 PCI Express 7.0 (×16 link) 1.936 Tbit/s: 242 GB/s: 2025 Infinity Fabric ...
It offers 20 PCIe 5.0 lanes (x16 for the expansion cards and x4 for storage) and an additional 4 PCIe 4.0 lanes for storage. The available PCIe lanes for the expansion cards can now be bifurcated to three devices (x8, x4, x4) instead of two, in case of LGA 1700.
Additionally, there are now 2 x 4 lane PCIe interfaces, most often used for M.2 storage devices. Whether the lanes connecting the GPUs in the mechanical x16 slots are executed as PCIe 4.0 or PCIe 5.0 can be configured by the mainboard manufacturers. Finally, 4 PCIe 5.0 lanes are reserved for connecting the south bridge chip or chipset.