Is PCIe 3.0 backward compatible

I have a motherboard with PCIe 2.0 graphics slots only. Will a PCIe 3.0 graphics card work if I plug it into one of the PCIe 2.0 slots?
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More about pcie backward compatible
  1. yes its backward compatible.card will 100%work in 2.0 mbo
  2. Yes it will work 100%
  3. Will the performance be downgraded?
  4. Depends on which graphic card.
  5. The performance may drop by a little. Not much.
  6. 3.0 cards in 2.0+ slot will work at 2.0+. 2.0 cards in older 1.0+ would work at 1.0+ . Simply, all of them are backward compatible. You could run it on PCI-e 1.0 x8; it would be bottlenecked but it would work. But at your case, I guess any single 3.0 graphics card could work normally on a Mobo with with PCIe 2.0 smoothly.
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