PCI Express 4.0 has incredible bandwidth. Do you need it now or is it better to wait?
Amazon.com: KONYEAD Quad PCIe NVMe M.2 SSD Adapter Card-PCI Express 3.0 x8 Card Support 4X M.2 NGFF PCIe NVMe SSD for Mac & PC (ASM2824 Switch)-Support Non-Bifurcation Motherboard(3002K) : Electronics
Amazon.com: Computer Motherboard, DDR3 Memory 32GB 4 Port PCI Express 16X Motherboard, DDR3 Computer Mainboard Accessories Fit for Bitcoin Mining Machine : Electronics
AWS Graviton3 Hits GA with 3 Sockets Per Motherboard Designs
Amazon.com: ASUS Prime X570-P Ryzen 3 AM4 with PCIe Gen4, Dual M.2 HDMI, SATA 6GB/s USB 3.2 Gen 2 ATX Motherboard : Electronics
MSI MPG B550 GAMING PLUS Gaming Motherboard (AMD AM4, DDR4, PCIe 4.0, SATA 6Gb/s, M.2, USB 3.2 Gen 2, HDMI/DP, ATX)
Amazon.com: MZHOU PCI-E to USB 3.0 PCI Express Card incl.1 USB C and 2 USB A Ports,Adding M.2 SATA III SSD Devices to a PC or Motherboard Using M.2 NVME to PCIe
Foxconn 945P7AA-8EKRS2 Motherboard Intel 945P chipset, 1 x PCIe x16, 2 x PCIe x1 767873477987 | eBay
Amazon.com: Motherboard Analyzer Diagnostic Card PCI/PCIE/Mini PCIE/LPC PC for Post Test Laptop Desktopmode : Electronics