PCIe 4 vs PCIe 3: Is it time to upgrade your motherboard?

A PCIe slot will not bottleneck the card But what CPU are you Nope, PCI-E x16 is still plenty of bandwidth 6162021

As Zef said, PCI-e is backwards compatible You can put a PCI-e GPU into a slot or a PCI-e GPU into a slot, it'll just run

pcie slot configuration gen1 gen2 gen3 After a quick Google search, I found this article which explains that: a PCIe x16 slot can theoretically hit approximately 32 gigabytes

pcie slot length 4-3, per single PCI Segment Group show less , ECN, November 18, 2018 Errata for the PCI Express® Base Specification Revision , , Errata, October 31