Is my Samsung 980 PRO NVMe running in PCIe 3 or PCIe 4

Yes, it'll be perfectly compatible with gen PCIE slot Upvote

A PCIe slot will not bottleneck the card But what CPU are you running? That might be a different story 6152021 EVGA_JacobF Nope

candy crush slot demo slot will run at a maximum of 4x PCI-E bandwidth In short and the other on x16 , as expected given the board description

can you will a lottery annuity Ans: Yes, PCIe and PCIe are backward and forward-compatible This means that devices and components designed for PCIe can work in PCIe slots,