use both PCIE x16 gen4 and gen3

pcie 4 gpu in pcie 3 slot   Dan pcie slot dimensions

GPU's with waterblocks are even narrower, generally a bit more than 1 PCIe slot wide You have three options for a 4 GPU rig, blower style GPU's

The CPU feeds those and the first slot all at PCIe There are 24 lanes on the CPU and the remaining 4 lanes go to the chipset at PCIe 4 The CPU feeds those and the first slot all at PCIe There are 24 lanes on the CPU and the remaining 4 lanes go to the chipset at PCIe 4

mb88 slot online Currently, even the fastest graphics cards from Intel, AMD, and Nvidia still utilize the outdated PCIe standard Sure, you can pair them with a PCIe Gen 5 Drive Interface · PCI Express · PCI Express · PCIe Gen 4 x16 · PCIe Gen 3 x16 · PCIe Gen 4 x8 ; Graphics Processing Unit NVIDIA GeForce RTX 4070 Ti