MSI PRO Z690-P DDR4 LGA1700 Motherboard Z690 Mainboard 128G 5000(OC) Support Intel 12th Gen ATX RGB Crossfire Dual Channels - AliExpress
Gigabyte GA-Z97X-SOC FORCE LGA 1150 Z97 Premium 4-Way CrossFire Support with OC Brace Killer E2200 Gaming Networking ATX Motherboard Buy, Best Price. Global Shipping.
ASRock > News
Don't Look For Open-Source AMD CrossFire Anytime Soon - Phoronix
Foxconn Shows Off Quad CrossFire Motherboard | TechPowerUp
AMD CrossFire - Wikipedia
CrossFire in AMD GPU: what is it, how to connect it and configure