Is PCI Express backwards compatible?

Related questions

1. Is PCI compatible with PCI Express?
2. Is PCI obsolete?
3. Will PCIe 2 work in PCIE x16?
4. What's the difference between PCI and PCIe?
5. Can I install PCIe card in PCI slot?
6. What PCIe 2.0 x16?
7. Why is PCIe faster than PCI?
8. Is PCI Express compatible with PCI?
9. Can you use PCI Express 3.0 in 2.0 slot?
10. Is WiFi card good for gaming?

Tags

1. #backwards
2. #modern
3. #three
4. #express
5. #graphics
6. #there
7. #compatible
8. #typically
9. #motherboard
10. #versions