ASROCK B550 STEEL LEGEND

Supports AMD AM4 Socket Ryzen™ 3000, 3000 G-Series, 4000 G-Series, 5000 and 5000 G-Series Desktop Processors*
upport DDR4 4733+(OC) / 4666(OC) / 4600(OC) / 4533(OC) / 4466(OC)
Supports AMD Quad CrossFireX™ and CrossFireX™
ATX Form Factor: 12.0-in x 9.6-in, 30.5 cm x 24.4 cm

Full Product Details:
https://www.asrock.com/mb/AMD/B550%20Steel%20Legend/index.asp