What exactly does the spec “PCIe x16 slot ” mean?

Re: DeckLink Quad 2 w Gen 4 PCIe x4 slot? PCIe is backwards compatible to the previous generations A PCIe Gen 2 card will work an a Gen

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x4d slot For example, PCIe x4 refers to a Gen 3 expansion card or slot with a four-lane configuration Likewise, PCIe x16 refers to a Gen 4

great book of magic slot Should work fine, it's the same as putting a 16x card in to a slot that's only wired for 8x or 4x, you don't get the full bandwidth but it will