use both PCIE x16 gen4 and gen3

While unlikely, some RTX 4090 buyers may still be on PCIe Gen 3 platforms, such as 10th Gen Core Comet Lake or Ryzen 2000 series PCIe Gen

PCIe Gen : 210 mm, 175 mm, 270 mm, 385 mm, 440 mm PCIe standard PCIe Gen PCIe Gen 3 slots with extra feet With horizontal SFF GPU

pcie 20 x16 slot The compatibility between PCIe graphics cards and PCIe slots stems from the backward compatibility feature engineered into the PCIe standard Although

pcie slot length Cooler Master MasterAccessory Universal Vertical Graphics Card Holder Kit V3 , ATX and m-ATX Support 4 PCi slots for installation GPU