Is PCI and PCIe compatible?

Related questions

1. What PCIe 2.0 x16?
2. How fast is PCIe 4?
3. Will PCIe 2 work in PCIE x16?
4. Is PCI and PCIe the same?
5. Is PCI obsolete?
6. What is a PCIe x1 slot used for?
7. What's the difference between PCI Express x1 and x16?
8. Are there different types of PCI Express slots?
9. Can PCIe x4 fit in PCIE x16?
10. Can you put a PCI card in a PCIe x16 slot?

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