4 x PCI Express x16 Intel Motherboards

#4 pci-e gpu are backwards compatible with pci-e slots, you might lose a few fps here and there but nothing to be concerned for

4-slot Customer Rating Top-Rated · 5 · 4 & Up · 3 & Up · 2 & Up PNY

pcie 40 in 30 slot ​As mentioned above, plugging a x4 PCI Express board into an x8 slot is acceptable This setup is called up-plugging The opposite—plugging a x8 PCI Express

pcie slot splitter PCIe , often referred to as PCIe Gen 4 and sometimes just PCI Simply put, PCIe Gen 4 has double the throughput of PCIe