The B450 Pro4 motherboard, with its code 90-MXB8B0-A0UAYZ, from ASRock, supports AMD's AM4 socket processors, including the Ryzen series. This motherboard is based on the B450 chipset, providing a balance between performance and cost, making it an attractive choice for mid-range gaming and productivity rigs. It offers dual M.2 slots for high-speed storage solutions, USB 3.1 Gen2 ports for rapid data transfer, and various PCIe slots to accommodate multiple expansion cards. Its ATX form factor provides ample room for connectivity and upgrades. The B450 Pro4 also supports up to 64GB of DDR4 RAM, has robust power phases for stable power delivery, and features high-quality audio capacitors for an improved sound experience. It's a well-rounded motherboard that meets the needs of gamers and general users alike.