PCIe 4.0: Everything you need to know, from specs to compatibility to caveats | PCWorld
Intel Optane SSD 900p Makes a Secret Appearance - has PCI Express 4.0 interface
Amazon.com: GLOTRENDS PCI Express 4.0/3.0 X4 Host Adapter Card with SFF-8643 Mini-SAS HD 36Pin Connector for U.2 (SFF-8639) PCIe SSD, Support Intel 750 2.5 inch U.2 SFF SSD : Electronics
798575-001 HP Intel 7260 Wireless-AC 7260 Dual Band 867Mbps 2.4GHz / 5GHz IEEE 802.11
Intel 7260 wifi card Dual Band 2.4GHz/5GHz Mini PCI-E WiFi Adapter for PC Laptop,Wireless-AC 1200Mbps 7260HMW Network Card 802.11ac wifi Bluetooth 4.0 Support Windows 7 8 10 (32/64-bit) Wireless Adapters - Newegg.com