One x16 slot. They'll use PCIe lanes in other slots (x4, x1, M2 SSDs) and also for devices off the chipset (network, USB, etc). The current top AMD/Intel CPUs c

One x16 slot. They'll use PCIe lanes in other slots (x4, x1, M2 SSDs) and also for devices off the chipset (network, USB, etc). The current top AMD/Intel CPUs can do ~100GB/sec over 28 lanes of mostly PCIe 5.