Is PCI Express compatible with PCI?

Related questions

1. Can I install PCIe card in PCI slot?
2. Can PCIe x4 fit in PCIE x16?
3. What is the difference between PCI and PCIe?
4. What's the difference between PCI Express x1 and x16?
5. How fast is PCIe 4?
6. What is the difference between PCIe x4 and PCIE x16?
7. Can PCI fit in PCIe slot?
8. Why is PCIe faster than PCI?
9. Is PCI obsolete?
10. What is a PCIe x1 slot used for?

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