x299 has up to 7 PCIe slots with only 28 PCIe 3 lanes. TRX40 has 64 PCIe 4 lanes. They could easily support a mode with 8 PCIe slots in PCIe 3 mode and full lan

x299 has up to 7 PCIe slots with only 28 PCIe 3 lanes. TRX40 has 64 PCIe 4 lanes. They could easily support a mode with 8 PCIe slots in PCIe 3 mode and full lanes. Instead we get 4 PCIe slots... My Deep Learning rig has 6 GPUs already.