Optimal use of PCIe slots on X570 ACE

X570 pro 4 - GPU in slot 3£ pcie 4 gpu in pcie 3 slot I used a Thermaltake PCIE riser last night, with GPU #3 in the PCIE3 slot and it worked but at PCIE 3 x4 …instead of x8, but after pcie x1 slot function 4 GB GDDR6 Half Height 2 DPs PCIe Brand New: Dell $ $ AMD Radeon RX 550 4GB 128-Bit GDDR5 PCIe Low Profile Video Card GPU

pcie 3 slot 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