PCI ( Peripheral Component Interconnect Express )
The pin numbers based on the “x” factor
| Number of Pins | Length | |
| PCI Express x1 | 18 | 25 mm |
| PCI Express x4 | 32 | 39 mm |
| PCI Express x8 | 49 | 56 mm |
| PCI Express x16 | 82 | 89 mm |
The bandwidth based on the PCIe technology:
| Bandwidth (per lane) | Bandwidth (per lane in an x16 slot) | |
| PCI Express 1.0 | 2 Gbit/s (250 MB/s) | 32 Gbit/s (4000 MB/s) |
| PCI Express 2.0 | 4 Gbit/s (500 MB/s) | 64 Gbit/s (8000 MB/s) |
| PCI Express 3.0 | 7.877 Gbit/s (984.625 MB/s) | 126.032 Gbit/s (15754 MB/s) |
| PCI Express 4.0 | 15.752 Gbit/s (1969 MB/s) | 252.032 Gbit/s (31504 MB/s) |