Question, concern PCIe PCIe

pcie 3 0 in 4 0 slot   Dan pcie 20 x1 slot

You can put a PCI-e GPU into a slot or a PCI-e GPU into a slot, it'll just run at the lowest supported revision between the two

Yes, PCIE is both backwards and forwards compatible, so you can use a PCIE 4 device in a PCIE 3 slot, but only at PCIE 3 speeds  A PCIe SSD card can be inserted into a motherboard having PCIe slots, but the SSD will not be able to make use of the greater bandwidth

4_7_23 lottery result 228022110 NVMe SSD slot x1 228022110 NVMe SSD slot x1 Memory expansion 1* PCIe x16 slot (Half-height, single It should be backward compatible, but you will see less performance than if you had it in a PCIe slot since it runs at PCIe x8 instead