Is a PCI-E x16 slot always compatible with a PCI-E x16 2.0 card?

I've read that this is only sometimes possible. If not, then how about a PCI-E x1 slot?
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More about slot compatible card
  1. There have not been any issues reported with version 2.0 cards in version 1.x slot. On the other hand there have been many issues with version 2.1 cards in 1.x slot.
  2. Best answer selected by advice pro.
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