ASRock B550M STEEL LEGEND mATX Motherboard Socket AM4 AMD B550 Chipset DDR4 4533MHz (Max 128GB) M.2 USB 3.2 Realtek 7.1 HD
Model #: B550M STEEL LEGEND Item #: MOTASR550SLR
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ASRock B550M STEEL LEGEND mATX Motherboard Socket AM4 AMD B550 Chipset DDR4 4533MHz (Max 128GB) M.2 USB 3.2 Realtek 7.1 HD

was $139.95 Special Price $129.95
Description AMD B550
Supports 3rd Gen AMD AM4 Ryzen / future AMD Ryzen Processors (3000 and 4000 Series Processors)
AMD Ryzen series CPUs (Matisse) 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
AMD Ryzen series APUs (Renoir) 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
   
Model  
Brand ASRock
Model B550 STEEL LEGEND
Supported CPU  
CPU Socket Type AM4
CPU Type Supports 3rd Gen AMD AM4 Ryzen / future AMD Ryzen Processors (3000 and 4000 Series Processors)*
* Not compatible with AMD Ryzen 5 3400G and Ryzen 3 3200G.
Chipset  
Chipset AMD B550
Memory  
Number of Memory Slots 4x288pin
Memory Standard AMD Ryzen series CPUs (Matisse) 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*
AMD Ryzen series APUs (Renoir) 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*

* For Ryzen Series CPUs (Picasso), ECC is only supported with PRO CPUs.
Maximum Memory Supported 128GB
** Due to the operating system limitation, the actual memory size may be less than 4GB for the reservation for system usage under Windows 32-bit OS. For Windows 64-bit OS with 64-bit CPU, there is no such limitation.
Channel Supported Dual Channel
Expansion Slots  
PCIe 4.0 x16 AMD Ryzen series CPUs (Matisse)
- 1 x PCI Express x16 Slots (PCIE1: Gen4x16 mode)*
AMD Ryzen series APUs (Renoir)
- 1 x PCI Express x16 Slots (PCIE1: Gen3x16 mode)*
* Supports NVMe SSD as boot disks
PCIe 3.0 x16 AMD Ryzen series CPUs (Matisse)
- 1 x PCI Express x16 Slots (PCIE3: Gen3 x4 mode)*
AMD Ryzen series APUs (Renoir)
- 1 x PCI Express x16 Slots (PCIE3: Gen3 x4 mode)*
* Supports NVMe SSD as boot disks
PCIe x1 2 x PCI Express 3.0 x1 Slots
Other Slots 1 x M.2 Socket (Key E), supports type 2230 WiFi/BT module
15µ Gold Contact in VGA PCIe Slot (PCIE1)
Storage Devices  
SATA 6GB/s 6 x SATA3 6.0Gb/s Connectors, support RAID, NCQ, AHCI and Hot Plug*
* M2_2 and SATA3_5_6 share lanes. If either one of them is in use, the other one will be disabled.
M.2 1 x Hyper M.2 Socket (M2_1), supports M Key type 2230/2242/2260/2280 M.2 PCI Express module up to Gen4x4 (64Gb/s) (with Matisse) or Gen3x4 (32Gb/s) (with Renoir)**
1 x M.2 Socket (M2_2), supports M Key type 2230/2242/2260/2280/22110 M.2 SATA3 6.0Gb/s module and M.2 PCI Express module up to Gen3 x2 (16Gb/s)**

** Supports NVMe SSD as boot disks
** Supports ASRock U.2 Kit
SATA RAID 0/1/10
Onboard Video  
Onboard Video Chipset 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.
Onboard Audio  
Audio Chipset Realtek ALC1220
Audio Channels 7.1 Channels
Onboard LAN  
LAN Chipset Dragon RTL8125BG
Max LAN Speed 10/100/1000Mbps
Rear Panel Ports  
Back I/O Ports 2 x Antenna Ports (on I/O Panel Shield)
1 x PS/2 Mouse/Keyboard Port
1 x HDMI Port
1 x DisplayPort 1.4
1 x Optical SPDIF Out Port
1 x USB 3.2 Gen2 Type-A Port (10Gb/s) (Supports ESD Protection)
1 x USB 3.2 Gen2 Type-C Port (10Gb/s) (Supports ESD Protection)
2 x USB 3.2 Gen1 Ports (Supports ESD Protection)
4 x USB 2.0 Ports (Supports ESD Protection)*
1 x RJ-45 LAN Port with LED (ACT/LINK LED and SPEED LED)
HD Audio Jacks: Rear Speaker / Central / Bass / Line in / Front Speaker / Microphone (Gold Audio Jacks)

* Ultra USB Power is supported on USB_34 ports.
* ACPI wake-up function is not supported on USB_34 ports.
Internal I/O Connectors  
Onboard USB 2 x USB 2.0 Headers (Support 4 USB 2.0 ports) (Supports ESD Protection)
1 x USB 3.2 Gen1 Header (Supports 2 USB 3.2 Gen1 ports) (Supports ESD Protection)
1 x Front Panel Type C USB 3.2 Gen1 Header (Supports ESD Protection)
Other Connectors 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)****
5 x Chassis/Water Pump Fan Connectors (4-pin) (Smart Fan Speed Control)*****
1 x Front Panel Audio Connector (15µ Gold Audio Connector)
1 x Dr. Debug with LED

* 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.
**** CPU_FAN2/WP_3A supports the water cooler fan of maximum 3A (36W) fan power.
***** The Chassis/Water Pump Fan supports the water cooler fan of maximum 2A (24W) fan power.
***** CPU_FAN2/WP_3A, CHA_FAN1/WP, CHA_FAN2/WP, CHA_FAN3/WP, CHA_FAN4/WP and CHA_FAN5/WP can auto detect if 3-pin or 4-pin fan is in use.
Physical Spec  
Form Factor ATX
LED Lighting RGB
Dimensions (W x L) 12.0" x 9.6"
Power Pin 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)
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ASRock B550M STEEL LEGEND mATX Motherboard Socket AM4 AMD B550 Chipset DDR4 4533MHz (Max 128GB) M.2 USB 3.2 Realtek 7.1 HD is available to buy in increments of 1