ASUS Z97-PRO GAMER Motherboard LGA 1150 DDR3 USB 3.0 PCIE 3.0 DVI HDMI D-Sub | eBay
StarTech.com PCI Express X1 to X16 Low Profile Slot Extension Adapter Card Model PEX1TO162 - Newegg.com
Amazon.com: ASUS ROG Strix B450-F Gaming II AMD AM4 (Ryzen 5000, 3rd Gen Ryzen ATX Gaming Motherboard (8+4 Power Stages, HDMI 2.0b/DP,2 x PCIe 3.0 x16, USB 3.2 Gen 2 Type-C, BIOS
hardware - What's the bandwidth and form factor for PCIe x1 x4 x8 and x16? - Server Fault