Everything You Need to Know About the PCI Express - Hardware Secrets
Posted: Monday, June 13, 2016 by Tyler Durden in
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Everything You Need to Know About the PCI Express - Hardware Secrets
Below is a table comparing the main specifications for the expansion slots that ever existed for the PC.
| Slot | Clock | Number of Bits | Data per Clock Cycle | Bandwidth |
| ISA | 4.77 MHz | 8 | 1 | 4.77 MB/s |
| ISA | 8 MHz | 16 | 0.5 | 8 MB/s |
| MCA | 5 MHz | 16 | 1 | 10 MB/s |
| MCA | 5 MHz | 32 | 1 | 20 MB/s |
| EISA | 8.33 MHz | 32 | 1 | 33.3 MB/s (16.7 MB/s typically) |
| VLB | 33 MHz | 32 | 1 | 133 MB/s |
| PCI | 33 MHz | 32 | 1 | 133 MB/s |
| PCI-X 66 | 66 MHz | 64 | 1 | 533 MB/s |
| PCI-X 133 | 133 MHz | 64 | 1 | 1,066 MB/s |
| PCI-X 266 | 133 MHz | 64 | 2 | 2,132 MB/s |
| PCI-X 533 | 133 MHz | 64 | 4 | 4,266 MB/s |
| AGP x1 | 66 MHz | 32 | 1 | 266 MB/s |
| AGP x2 | 66 MHz | 32 | 2 | 533 MB/s |
| AGP x4 | 66 MHz | 32 | 4 | 1,066 MB/s |
| AGP x8 | 66 MHz | 32 | 8 | 2,133 MB/s |
| PCIe 1.0 x1 | 2.5 GHz | 1 | 1 | 250 MB/s |
| PCIe 1.0 x4 | 2.5 GHz | 4 | 1 | 1,000 MB/s |
| PCIe 1.0 x8 | 2.5 GHz | 8 | 1 | 2,000 MB/s |
| PCIe 1.0 x16 | 2.5 GHz | 16 | 1 | 4,000 MB/s |
| PCIe 2.0 x1 | 5 GHz | 1 | 1 | 500 MB/s |
| PCIe 2.0 x4 | 5 GHz | 4 | 1 | 2,000 MB/s |
| PCIe 2.0 x8 | 5 GHz | 8 | 1 | 4,000 MB/s |
| PCIe 2.0 x16 | 5 GHz | 16 | 1 | 8,000 MB/s |
| PCIe 3.0 x1 | 8 GHz | 1 | 1 | 1,000 MB/s |
| PCIe 3.0 x4 | 8 GHz | 4 | 1 | 4,000 MB/s |
| PCIe 3.0 x8 | 8 GHz | 8 | 1 | 8,000 MB/s |
| PCIe 3.0 x16 | 8 GHz | 16 | 1 | 16,000 MB/s |
Read more at http://www.hardwaresecrets.com/everything-you-need-to-know-about-the-pci-express/#6QPQWY6YLpBfVzBS.99
