Dual PCI Slot To PCI-E 1X PCIe X1 Adapter Expansion Riser Card

1 PCIe x16, 1 PCIe x16, 1 PCIe x1, 1 Key E for WiFi - 1 x PCI Express x1 Slot - Supports AMD Quad CrossFireX™ and CrossFireX

So, there is no singular PCI Express slot There are actually four sizes : PCI Express x1, PCI Express x4, PCI Express x8, and PCI Express x16

pcie 4 nvme in pcie 3 slot PCIe slots are used to connect graphics cards, sound cards, other interface cards and some

pcie gen 4 in gen 3 slot Yes, a x1 card should work in a x16 slot It's good that you've got it to work in a x1 slot What else have you tried it in besides the x16 slot