Question - PCIE x8 into a PCIE x4

using pcie 4 in 3 slot   Dan marvelous mouse coin combo slot

Hello, is the Surface 8 Pro compatible with PCIe 4 drives or can I only use PCIe 3 ssd? If not all drives are compatible, which drives work?

Slot configurations without DWCM​ ; Figure 5 Rear view with 2 PCIe slots ; Riser 1, x16 , Riser 2 ; Slot 3, PCIe x16, Slot 6 ; Figure 6  with x16 PCI express socket) it will be also x8 PCI For your 653206-B21 HP DL380p560 Gen8 3 Slot PCI-E Riser Kit => but it

kode open slot A PCIe graphics card will work in a PCIe motherboard slot at PCIe speeds For PCIe graphics cards, maximum graphics throughput 2 slots where at least one supports PCIe, it's worth considering your secondary slot for an SSD upgrade When combined with an NVMe SSD, PCIe will result in