Perhaps use open-ended PCIe x1 slots instead of PCIe x16 slots? #9

First, it offers more physical support So, if you've got a big heavy GPU in a tower case without a support at the far end of the card, a 1x

PCIe x1: These are the smallest PCIe slots, used for almost any other cards like average network adapters and USB expansion cards · PCIe x4:

pcie4 slot I see various mobos with, for example, 'half-length' PCIe x16 slots But this is a contradiction in terms A PCIe x16 slot by definition is

pcie slot bracket PCI Express Expansion ; Downstream slot port PCIe x16 PCI-E SMT Type Slot Supports PCI Express Gen 4 Bandwidth ; Power connector One SATA 15pin power