Model Brand ASUS Model PRIME B550M-A WIFI II Supported CPU CPU Socket Type AM4 CPU Type Supports AMD Ryzen 5000 Series / 5000 G-Series / 4000 G-Series / 3000 Series Processors Chipsets Chipset AMD B550 Memory Number of Memory Slots 4x288pin (DDR4) Memory Standard DDR4 4866(OC) / 4800(OC) / 4600(OC) / 4466(OC) / 4400(OC) / 4333(OC) / 4266(OC) / 4200(OC) / 4133(OC) / 4000(OC) / 3866(OC) / 3733(OC) / 3600(OC) / 3466(OC) / 3400(OC) / 3333(OC) / 3200 / 3000 / 2933 / 2800 / 2666 / 2400 / 2133* Maximum Memory Supported 128GB Channel Supported Dual Channel ECC Supported ECC memory (ECC mode) support varies by CPU Buffer Supported Un-buffered Expansion Slots PCI Express 4.0 x16 1 x PCI Express 4.0 x16* PCI Express x1 2 x PCIe 3.0 x1 Storage Devices SATA 6Gb/s 4 x SATA 6Gb/s M.2 AMD Ryzen 5000 Series/ 3000 Series Desktop Processors: M.2_1 slot (Key M), type 2242/2260/2280/22110 (supports PCIe 4.0 x4 & SATA modes) AMD Ryzen 5000 G-Series/ 4000 G-Series Desktop Processors: M.2_1 slot (Key M), type 2242/2260/2280/22110 (supports PCIe 3.0 x4 & SATA modes) AMD B550 Chipset: M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 3.0 x4 & SATA modes) SATA RAID 0/1/10 Onboard Video Onboard Video Chipset Supported only by CPU with integrated graphic Onboard Audio Audio Chipset Realtek 7.1 Surround Sound High Definition Audio CODEC Audio Channels 7.1 Channels* Onboard LAN LAN Chipset Realtek 1Gb Ethernet Max LAN Speed 10/100/1000Mbps Wireless LAN Wi-Fi 6 802.11 a/b/g/n/ac/ax Bluetooth Bluetooth 5.2 Rear Panel Ports Back I/O Ports 2 x USB 3.2 Gen 2 ports (2 x Type-A) 4 x USB 3.2 Gen 1 ports (4 x Type-A) 1 x D-Sub port 1 x DVI-D port 1 x HDMI port 1 x Wi-Fi Module 1 x Realtek 1Gb Ethernet port 3 x Audio jacks 1 x PS/2 Keyboard/Mouse combo port Internal I/O Connectors Onboard USB 1 x USB 3.2 Gen 1 header supports additional 2 USB 3.2 Gen 1 ports 2 x USB 2.0 headers support