ASRock B550M Steel Legend

- Supports 3rd Gen AMD AM4 Ryzen™ / future AMD Ryzen™ Processors* - Digi Power design - 10 Power Phase design

*Not compatible with AMD Ryzen™ 5 3400G and Ryzen™ 3 3200G.

- Dual Channel DDR4 Memory Technology - 4 x DDR4 DIMM Slots - AMD Ryzen series CPUs (Matisse) support DDR4 4533+(OC) / 4466(OC) / 4400(OC) / 4333(OC) / 4266(OC) / 4200(OC) / 4133(OC) / 4000(OC) / 3866(OC) / 3800(OC) / 3733(OC) / 3600(OC) / 3466(OC) / 3200 / 2933 / 2667 / 2400 / 2133 ECC & non-ECC, un-buffered memory* - AMD Ryzen series APUs support DDR4 4733+(OC) / 4666(OC) / 4600(OC) / 4533(OC) / 4466(OC) / 4400(OC) / 4333(OC) / 4266(OC) / 4200(OC) / 4133(OC) / 4000(OC) / 3866(OC) / 3800(OC) / 3733(OC) / 3600(OC) / 3466(OC) / 3200 / 2933 / 2667 / 2400 / 2133 ECC & non-ECC, un-buffered memory* - Max. capacity of system memory: 128GB** - Supports Extreme Memory Profile (XMP) memory modules - 15µ Gold Contact in DIMM Slots

*For Ryzen Series CPUs (Picasso), ECC is only supported with PRO CPUs.

- Integrated AMD Radeon Vega Series Graphics in Ryzen Series APU* - DirectX 12, Pixel Shader 5.0 - Shared memory default 2GB. Max Shared memory supports up to 16GB.** - Dual graphics output: support HDMI and DisplayPort 1.4 ports by independent display controllers - Supports HDMI 2.1 with max. resolution up to 4K x 2K (4096x2160) @ 60Hz - Supports DisplayPort 1.4 with max. resolution up to 5K (5120x2880)@120Hz - Supports Auto Lip Sync, Deep Color (12bpc), xvYCC and HBR (High Bit Rate Audio) with HDMI 2.1 Port (Compliant HDMI monitor is required) - Supports HDR (High Dynamic Range) with HDMI 2.1 - Supports HDCP 2.3 with HDMI 2.1 and DisplayPort 1.4 Ports - Supports 4K Ultra HD (UHD) playback with HDMI 2.1 and DisplayPort 1.4 Ports - Supports Microsoft PlayReady

*Actual support may vary by CPU

**The Max shared memory 16GB requires 32GB system memory installed.

AMD Ryzen series CPUs (Matisse) - 2 x PCI Express x16 Slots (PCIE1: Gen4x16 mode; PCIE3: Gen3 x4 mode)* AMD Ryzen series APUs - 2 x PCI Express x16 Slots (PCIE1: Gen3x16 mode; PCIE3: Gen3 x4 mode)*

- 1 x PCI Express 3.0 x1 Slot - Supports AMD Quad CrossFireX™ and CrossFireX™ - 15µ Gold Contact in VGA PCIe Slot (PCIE1) - 1 x M.2 Socket (Key E), supports type 2230 WiFi/BT module

*Supports NVMe SSD as boot disks

- 6 x SATA3 6.0 Gb/s Connectors, support RAID (RAID 0, RAID 1 and RAID 10), NCQ, AHCI and Hot Plug* - 1 x Hyper M.2 Socket (M2_1), supports M Key type 2280 M.2 PCI Express module up to Gen4x4 (64 Gb/s) (with Matisse) or Gen3x4 (32 Gb/s)** - 1 x M.2 Socket (M2_2), supports M Key type 2280 M.2 SATA3 6.0 Gb/s module and M.2 PCI Express module up to Gen3 x2 (16 Gb/s)**

*M2_2 and SATA3_5_6 share lanes. If either one of them is in use, the other one will be disabled.

**Supports NVMe SSD as boot disks Supports ASRock U.2 Kit

- 1 x SPI TPM Header - 1 x Power LED and Speaker Header - 2 x RGB LED Headers* - 2 x Addressable LED Headers** - 1 x CPU Fan Connector (4-pin)*** - 1 x CPU/Water Pump Fan Connector (4-pin) (Smart Fan Speed Control) - 4 x Chassis/Water Pump Fan Connectors (4-pin) (Smart Fan Speed Control)**** - 1 x 24 pin ATX Power Connector (Hi-Density Power Connector) - 1 x 8 pin 12V Power Connector (Hi-Density Power Connector) - 1 x 4 pin 12V Power Connector (Hi-Density Power Connector) - 1 x Front Panel Audio Connector - 2 x USB 2.0 Headers (Support 4 USB 2.0 ports) (Supports ESD Protection) - 2 x USB 3.2 Gen1 Headers (Support 4 USB 3.2 Gen1 ports) (Supports ESD Protection)

*Support in total up to 12V/3A, 36W LED Strip

**Support in total up to 5V/3A, 15W LED Strip

***The CPU Fan Connector supports the CPU fan of maximum 1A (12W) fan power.

****The Chassis/Water Pump Fan supports the water cooler fan of maximum 2A (24W) fan power. CPU_FAN2/WP, CHA_FAN1/WP, CHA_FAN2/WP, CHA_FAN3/WP and CHA_FAN4/WP can auto detect if 3-pin or 4-pin fan is in use.

Software - ASRock Motherboard Utility (A-Tuning) - ASRock Polychrome SYNC* UEFI - ASRock Full HD UEFI - ASRock Instant Flash

*These utilities can be downloaded from ASRock Live Update & APP Shop.