ASROCK B550M Steel Legend User Manual
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ASROCK B550M Steel Legend User Manual

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  • Page 2 (including damages for loss of profits, loss of business, loss of data, interruption of business and the like), even if ASRock has been advised of the possibility of such damages arising from any defect or error in the documentation or product.
  • Page 3 You are also entitled to have the goods repaired or replaced if the goods fail to be of acceptable quality and the failure does not amount to a major failure. If you require assistance please call ASRock Tel : +886-2-28965588 ext.123 (Standard International call charges apply) The terms HDMI®...

  • Page 4: Table Of Contents

    Contents Chapter 1 Introduction Package Contents Specifications Motherboard Layout I/O Panel Chapter 2 Installation Installing the CPU Installing the CPU Fan and Heatsink Installing Memory Modules (DIMM) Expansion Slots (PCI Express Slots) Jumpers Setup Onboard Headers and Connectors Clear CMOS Button Post Status Checker CrossFireX and Quad CrossFireX...
  • Page 5 Chapter 3 Software and Utilities Operation Installing Drivers ASRock Motherboard Utility (A-Tuning) 3.2.1 Installing ASRock Motherboard Utility (A-Tuning) 3.2.2 Using ASRock Motherboard Utility (A-Tuning) ASRock Live Update & APP Shop 3.3.1 UI Overview 3.3.2 Apps 3.3.3 BIOS & Drivers 3.3.4 Setting...
  • Page 6 4.4.6 AMD CBS 4.4.7 AMD PBS 4.4.8 AMD Overclocking Tools Hardware Health Event Monitoring Screen Security Screen Boot Screen Exit Screen...

  • Page 7: Chapter 1 Introduction

    If you require technical support related to this mother- board, please visit our website for specific information about the model you are using. You may find the latest VGA cards and CPU support list on ASRock’s website as well. ASRock website http://www.asrock.com.

  • Page 8: Specifications

    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* * Please refer to Memory Support List on ASRock’s website for more information. (http://www.asrock.com/) * Please refer to page 22 for DDR4 UDIMM maximum frequency support. • Max. capacity of system memory: 128GB • Supports Extreme Memory Profile (XMP) memory modules...
  • Page 9 B550M Steel Legend • 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 Graphics • Integrated AMD Radeon Vega Series Graphics in Ryzen...
  • Page 10 • 2.5 Gigabit LAN 10/100/1000/2500 Mb/s • Dragon RTL8125BG • Supports Dragon 2.5G LAN Software - Smart Auto Adjust Bandwidth Control - Visual User Friendly UI - Visual Network Usage Statistics - Optimized Default Setting for Game, Browser, and Streaming Modes - User Customized Priority Control • Supports Wake-On-LAN • Supports Lightning/ESD Protection...
  • Page 11 SATA3 6.0 Gb/s module and M.2 PCI Express module up to Gen3 x2 (16 Gb/s)** ** Supports NVMe SSD as boot disks ** Supports ASRock U.2 Kit Connector • 1 x SPI TPM Header • 1 x Power LED and Speaker Header • 2 x RGB LED Headers...
  • Page 12 • ErP/EuP ready (ErP/EuP ready power supply is required) tions * For detailed product information, please visit our website: http://www.asrock.com Please realize that there is a certain risk involved with overclocking, including adjusting the setting in the BIOS, applying Untied Overclocking Technology, or using third-party overclocking tools.

  • Page 13: Motherboard Layout

    B550M Steel Legend 1.3 Motherboard Layout CPU_FAN2/WP CLRC BTN1 RGB_LED1 ATX12V2 ATX12V1 CPU_FAN1 ADDR_LED1 USB 2.0 T: USB1 B: USB2 USB 3.2 Gen2 T: USB31_TA_1 B: USB31_TC_1 USB 3.2 Gen1 T: USB3_1 B: USB3_2 USB 3.2 Gen1 T: USB3_3 B: USB3_4...
  • Page 14 No. Description 8 pin 12V Power Connector (ATX12V1) 4 pin 12V Power Connector (ATX12V2) CPU Fan Connector (CPU_FAN1) CPU/Water Pump Fan Connector (CPU_FAN2/WP) 2 x 288-pin DDR4 DIMM Slots (DDR4_A1, DDR4_B1) 2 x 288-pin DDR4 DIMM Slots (DDR4_A2, DDR4_B2) RGB LED Header (RGB_LED1) Addressable LED Header (ADDR_LED1) ATX Power Connector (ATXPWR1) USB 3.2 Gen1 Header (F_USB3_1_2)

  • Page 15: I/O Panel

    B550M Steel Legend 1.4 I/O Panel No. Description No. Description USB 2.0 Ports (USB_12)* USB 3.2 Gen1 Ports Antenna Ports (USB3_12) (on I/O Panel Shield) USB 3.2 Gen2 Type-A Port LAN RJ-45 Port** (USB31_TA_1) Central / Bass (Orange) USB 3.2 Gen2 Type-C Port...
  • Page 16 ** There are two LEDs on each LAN port. Please refer to the table below for the LAN port LED indications. ACT/LINK LED SPEED LED LAN Port Activity / Link LED Speed LED Status Description Status Description No Link 10Mbps connection 100Mbps/1Gbps Blinking Data Activity...

  • Page 17: Chapter 2 Installation

    B550M Steel Legend Chapter 2 Installation This is a Micro ATX form factor motherboard. Before you install the motherboard, study the configuration of your chassis to ensure that the motherboard fits into it. Pre-installation Precautions Take note of the following precautions before you install motherboard components or change any motherboard settings.

  • Page 18: Installing The Cpu

    2.1 Installing the CPU Unplug all power cables before installing the CPU.
  • Page 19 B550M Steel Legend...

  • Page 20: Installing The Cpu Fan And Heatsink

    2.2 Installing the CPU Fan and Heatsink After you install the CPU into this motherboard, it is necessary to install a larger heatsink and cooling fan to dissipate heat. You also need to spray thermal grease between the CPU and the heatsink to improve heat dissipation. Make sure that the CPU and the heatsink are securely fastened and in good contact with each other.
  • Page 21 B550M Steel Legend...
  • Page 22 Installing the AM4 Box Cooler SR2...
  • Page 23 B550M Steel Legend...
  • Page 24 *The diagrams shown here are for reference only. The headers might be in a different position on your motherboard.
  • Page 25 B550M Steel Legend Installing the AM4 Box Cooler SR3...
  • Page 27 B550M Steel Legend +12V *The diagrams shown here are for reference only. The headers might be in a different position on your motherboard.

  • Page 28: Installing Memory Modules (Dimm)

    2.3 Installing Memory Modules (DIMM) This motherboard provides four 288-pin DDR4 (Double Data Rate 4) DIMM slots, and supports Dual Channel Memory Technology. 1. For dual channel configuration, you always need to install identical (the same brand, speed, size and chip-type) DDR4 DIMM pairs. 2.
  • Page 29 B550M Steel Legend Ryzen Series APUs (Renoir): UDIMM Memory Slot Frequency (Mhz) 3200 3200 3200 3200 2933 SR/DR SR/DR 2667 SR/DR SR/DR SR/DR SR/DR 2667 SR: Single rank DIMM, 1Rx4 or 1Rx8 on DIMM module label DR: Dual rank DIMM, 2Rx4 or 2Rx8 on DIMM module label...
  • Page 30 The DIMM only fits in one correct orientation. It will cause permanent damage to the motherboard and the DIMM if you force the DIMM into the slot at incorrect orientation.

  • Page 31: Expansion Slots (Pci Express Slots)

    B550M Steel Legend 2.4 Expansion Slots (PCI Express Slots) There are 3 PCI Express slots on the motherboard. Before installing an expansion card, please make sure that the power supply is switched off or the power cord is unplugged. Please read the documentation of the expansion card and make necessary hardware settings for the card before you start the installation.

  • Page 32: Jumpers Setup

    2.5 Jumpers Setup The illustration shows how jumpers are setup. When the jumper cap is placed on the pins, the jumper is “Short”. If no jumper cap is placed on the pins, the jumper is “Open”. Clear CMOS Jumper Short: Clear CMOS (CLRCMOS1) Open: Default 2-pin Jumper...

  • Page 33: Onboard Headers And Connectors

    B550M Steel Legend 2.6 Onboard Headers and Connectors Onboard headers and connectors are NOT jumpers. Do NOT place jumper caps over these headers and connectors. Placing jumper caps over the headers and connectors will cause permanent damage to the motherboard.
  • Page 34 Power LED and Speaker Please connect the SPEAKER DUMMY Header chassis power LED and DUMMY (7-pin SPK_PLED1) the chassis speaker to this (see p.7, No. 18) header. PLED+ PLED+ PLED- Serial ATA3 Connectors These six SATA3 (SATA3_1: connectors support SATA see p.7, No.
  • Page 35 B550M Steel Legend IntA_P_D+ (19-pin F_USB3_3_4) IntA_P_D- IntA_P_SSTX+ (see p.7, No. 19) IntA_P_SSTX- IntA_P_SSRX+ IntA_P_SSRX- Vbus Vbus IntA_P_SSRX- IntA_P_SSRX+ IntA_P_SSTX- IntA_P_SSTX+ IntA_P_D- IntA_P_D+ Front Panel Audio Header This header is for PRESENCE# MIC_RET (9-pin HD_AUDIO1) connecting audio devices OUT_RET (see p.7, No. 30) to the front audio panel.
  • Page 36 (4-pin CHA_FAN2/WP) FAN_VOLTAGE FAN_SPEED (see p.7, No. 25) FAN_SPEED_CONTROL (4-pin CHA_FAN3/WP) (see p.7, No. 26) (4-pin CHA_FAN4/WP) (see p.7, No. 20) CPU Fan Connector This motherboard pro- (4-pin CPU_FAN1) vides a 4-Pin CPU fan (see p.7, No. 3) (Quiet Fan) connector. FAN_VOLTAGE CPU_F AN_SPEED...
  • Page 37 B550M Steel Legend ATX 12V Power This motherboard Connector provides an 8-pin ATX (8-pin ATX12V1) 12V power connector. To (see p.7, No. 1) use a 4-pin ATX power supply, please plug it along Pin 1 and Pin 5. *Warning: Please make...
  • Page 38 RGB LED Headers These two RGB headers are used (4-pin RGB_LED1) to connect RGB LED extension (see p.7, No. 7) cable which allows users to choose from various LED lighting effects. Caution: Never install the RGB LED cable in the wrong orienta- (4-pin RGB_LED2) tion;...

  • Page 39: Clear Cmos Button

    B550M Steel Legend 2.7 Clear CMOS Button The motherboard has a Clear CMOS Button, allowing users to quickly clear the CMOS values. Clear CMOS Button Clear CMOS Button (CLRCBTN1) allows users to quickly (see p.9, No. 17) clear the CMOS values.

  • Page 40: Post Status Checker

    2.8 Post Status Checker Post Status Checker (PSC) diagnoses the computer when users power on the machine. It emits a red light to indicate whether the CPU, memory, VGA or stor- age is dysfunctional. The lights go off if the four mentioned above are functioning normally.

  • Page 41: Tm Tm

    B550M Steel Legend 2.9 CrossFireX and Quad CrossFireX Operation Guide This motherboard supports CrossFireX and Quad CrossFireX that allows you to install up to two identical PCI Express x16 graphics cards. 1. You should only use identical CrossFireX -ready graphics cards that are AMD certified.
  • Page 42 Step 3 Connect a VGA/DVI/DP/HDMI cable from the monitor to the corresponding port on the graphics card installed to the PCIE1 slot.

  • Page 43: Driver Installation And Setup

    B550M Steel Legend 2.9.2 Driver Installation and Setup Step 1 Power on your computer and boot into OS. Step 2 Remove the AMD drivers if you have any VGA drivers installed in your system. The Catalyst Uninstaller is an optional download. We recommend using this utility to uninstall any previously installed Catalyst drivers prior to installation.

  • Page 44: Wifi/Bt Module Installation Guide (M2_3)

    2.10 M.2 WiFi/BT Module Installation Guide (M2_3) The M.2, also known as the Next Generation Form Factor (NGFF), is a small size and versatile card edge connector that aims to replace mPCIe and mSATA. The M.2 Socket (Key E) supports type 2230 WiFi/BT module. * The M.2 socket does not support SATA M.2 SSDs.
  • Page 45 B550M Steel Legend Step 4 Tighten the screw with a screwdriver to secure the module into place. Please do not overtighten the screw as this might damage the module.

  • Page 46: M.2_Ssd (Ngff) Module Installation Guide (M2_1)

    2.11 M.2_SSD (NGFF) Module Installation Guide (M2_1) The M.2, also known as the Next Generation Form Factor (NGFF), is a small size and versatile card edge connector that aims to replace mPCIe and mSATA. The 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) (with Renoir).
  • Page 47 B550M Steel Legend Step 3 Before installing a M.2 (NGFF) SSD module, please loosen the screws to remove the M.2 heatsink. *Please remove the protective films on the bottom side of the M.2 heatsink before you install a M.2 SSD module.
  • Page 48 XP941-512G (MZHPU512HCGL) SanDisk PCIe SD6PP4M-128G SanDisk PCIe SD6PP4M-256G TEAM PCIe3 x4 TM8FP2240G0C101 TEAM PCIe3 x4 TM8FP2480GC110 PCIe3 x4 WDS256G1X0C-00ENX0 (NVME) PCIe3 x4 WDS512G1X0C-00ENX0 (NVME) For the latest updates of M.2_SSD (NFGG) module support list, please visit our website for details: http://www.asrock.com...

  • Page 49: M.2_Ssd (Ngff) Module Installation Guide (M2_2)

    B550M Steel Legend 2.12 M.2_SSD (NGFF) Module Installation Guide (M2_2) The M.2, also known as the Next Generation Form Factor (NGFF), is a small size and versatile card edge connector that aims to replace mPCIe and mSATA. The M.2 Socket (M2_2) supports M Key type 2280 M.2 SATA3 6.0 Gb/s module and M.2 PCI Express...
  • Page 50 Step 3 Align and gently insert the M.2 (NGFF) SSD module into the M.2 slot. Please be aware that the M.2 (NGFF) SSD module only fits in one orientation. Step 4 Tighten the screw with a screwdriver to secure the module into place. Please do not overtighten the screw as this might damage the module.
  • Page 51 B550M Steel Legend M.2_SSD (NGFF) Module Support List (M2_2) Vendor Interface ADATA SATA3 AXNS330E-32GM-B ADATA SATA3 AXNS381E-128GM-B ADATA SATA3 AXNS381E-256GM-B ADATA SATA3 ASU800NS38-256GT-C ADATA SATA3 ASU800NS38-512GT-C Crucial SATA3 CT120M500SSD4 Crucial SATA3 CT240M500SSD4 Intel SATA3 Intel SSDSCKGW080A401/80G Kingston SATA3 SM2280S3 Plextor...

  • Page 52: Chapter 3 Software And Utilities Operation

    Chapter 3 Software and Utilities Operation 3.1 Installing Drivers The Support CD that comes with the motherboard contains necessary drivers and useful utilities that enhance the motherboard’s features. Running The Support CD To begin using the support CD, insert the CD into your CD-ROM drive. The CD automatically displays the Main Menu if “AUTORUN”...

  • Page 53: Asrock Motherboard Utility (A-Tuning)

    3.2.1 Installing ASRock Motherboard Utility (A-Tuning) ASRock Motherboard Utility (A-Tuning) can be downloaded from ASRock Live Update & APP Shop. After the installation, you will find the icon “ASRock Mother- board Utility (A-Tuning)“ on your desktop. Double-click the “ASRock Motherboard Utility (A-Tuning)“...
  • Page 54 OC Tweaker Configurations for overclocking the system. System Info View information about the system. *The System Browser tab may not appear for certain models.
  • Page 55 Settings Configure ASRock ASRock Motherboard Utility (A-Tuning). Click to select "Auto run at Windows Startup" if you want ASRock Motherboard Utility (A-Tuning) to be launched when you start up the Windows operating system.

  • Page 56: Asrock Live Update & App Shop

    Double-click on your desktop to access ASRock Live Update & APP Shop utility. *You need to be connected to the Internet to download apps from the ASRock Live Update & APP Shop. 3.3.1 UI Overview Category Panel Hot News...

  • Page 57: Apps

    B550M Steel Legend 3.3.2 Apps When the "Apps" tab is selected, you will see all the available apps on screen for you to download. Installing an App Step 1 Find the app you want to install. The most recommended app appears on the left side of the screen. The other various apps are shown on the right.
  • Page 58 Step 3 If you want to install the app, click on the red icon to start downloading. Step 4 When installation completes, you can find the green "Installed" icon appears on the upper right corner. To uninstall it, simply click on the trash can icon *The trash icon may not appear for certain apps.
  • Page 59 B550M Steel Legend Upgrading an App You can only upgrade the apps you have already installed. When there is an available new version for your app, you will find the mark of "New Version" appears below the installed app icon.

  • Page 60: Bios & Drivers

    3.3.3 BIOS & Drivers Installing BIOS or Drivers When the "BIOS & Drivers" tab is selected, you will see a list of recommended or critical updates for the BIOS or drivers. Please update them all soon. Step 1 Please check the item information before update. Click on to see more details.

  • Page 61: Setting

    B550M Steel Legend 3.3.4 Setting In the "Setting" page, you can change the language, select the server location, and determine if you want to automatically run the ASRock Live Update & APP Shop on Windows startup.

  • Page 62: Nahimic Audio

    3.4 Nahimic Audio Nahimic audio software provides an incredible high definition sound technology which boosts the audio and voice performance of your system. Nahimic Audio interface is composed of four tabs : Audio, Microphone, Sound Tracker and Settings. There are four functions in Nahimic audio : Function Description From this tab, you can mute the current audio device, choose...

  • Page 63: Asrock Polychrome Sync

    B550M Steel Legend 3.5 ASRock Polychrome SYNC ASRock Polychrome SYNC is a lighting control utility specifically designed for unique indi- viduals with sophisticated tastes to build their own stylish colorful lighting system. Simply by connecting the LED strip, you can customize various lighting schemes and patterns, including Static, Breathing, Strobe, Cycling, Music, Wave and more.
  • Page 64 Connecting the Addressable RGB LED Strip Connect your Addressable RGB LED strips to the Addressable LED Headers (ADDR_LED1, ADDR_LED2) on the motherboard. ADDR_LED1 VOUT DO_ADDR ADDR_LED2 DO_ADDR VOUT 1. Never install the RGB LED cable in the wrong orientation; otherwise, the cable may be damaged.
  • Page 65 ASRock Polychrome SYNC Utility Now you can adjust the RGB LED color through the ASRock Polychrome SYNC Utility. Download this utility from the ASRock Live Update & APP Shop and start coloring your PC style your way! Drag the tab to customize your preference.

  • Page 66: Chapter 4 Uefi Setup Utility

    Chapter 4 UEFI SETUP UTILITY 4.1 Introduction This section explains how to use the UEFI SETUP UTILITY to configure your system. You may run the UEFI SETUP UTILITY by pressing <F2> or <Del> right after you power on the computer, otherwise, the Power-On-Self-Test (POST) will continue with its test routines.

  • Page 67: Navigation Keys

    B550M Steel Legend 4.1.2 Navigation Keys Use < > key or < > key to choose among the selections on the menu bar, and use < > key or < > key to move the cursor up or down to select items, then press <Enter>...

  • Page 68: Main Screen

    4.2 Main Screen When you enter the UEFI SETUP UTILITY, the Main screen will appear and display the system overview.

  • Page 69: Oc Tweaker Screen

    B550M Steel Legend 4.3 OC Tweaker Screen In the OC Tweaker screen, you can set up overclocking features. Because the UEFI software is constantly being updated, the following UEFI setup screens and descriptions are for reference purpose only, and they may not exactly match what you see on your screen.
  • Page 70 CCD0 CCX0 Frequency (MHz) Use this item to adjust CCX0 Frequency. CCX1 Frequency (MHz) Use this item to adjust CCX1 Frequency. CCD1 CCX0 Frequency (MHz) Use this item to adjust CCX0 Frequency. CCX1 Frequency (MHz) Use this item to adjust CCX1 Frequency. SoC/Uncore OC Voltage(VID) Specify the SoC/Uncore voltage (VDD_SOC) in mV to support memory and Infinity Fabric overclocking.
  • Page 71 B550M Steel Legend DRAM Information Load XMP Setting Load XMP settings to overclock the memory and perform beyond standard specifications. DRAM Frequency If [Auto] is selected, the motherboard will detect the memory module(s) inserted and assign the appropriate frequency automatically. Setting DRAM Frequency can adjust DRAM Timing.
  • Page 72 CPU VDD 1.8V Voltage Configure the voltage for the CPU VDD 1.8V Voltage. The default value is [Auto]. Save User Default Type a profile name and press enter to save your settings as user default. Load User Default Load previously saved user defaults. Save User UEFI Setup Profile to Disk It helps you to save current UEFI settings as an user profile to disk.

  • Page 73: Advanced Screen

    B550M Steel Legend 4.4 Advanced Screen In this section, you may set the configurations for the following items: CPU Configuration, Onboard Devices Configuration, Storage Configuration, ACPI Con- figuration, Trusted Computing, AMD CBS, AMD PBS and AMD Overclocking. Setting wrong values in this section may cause the system to malfunction.

  • Page 74: Cpu Configuration

    4.4.1 CPU Configuration PSS Support Use this to enable or disable the generation of ACPI_PPC, _PSS, and _PCT objects. NX Mode Use this to enable or disable NX mode. SVM Mode When this is set to [Enabled], a VMM (Virtual Machine Architecture)can utilize the additional hardware capabilities provided by AMD-V.

  • Page 75: Onboard Devices Configuration

    B550M Steel Legend 4.4.2 Onboard Devices Configuration Turn On LED in S5 Turn on LED in the ACPI S5 state. SR-IOV Support Enable/disable the SR-IOV (Single Root IO Virtualization Support) if the system has SR-IOV capable PCIe devices. UMA Frame buffer Size (Only for processor with integrated graphics) This item allows you to set the size of the UMA frame buffer.
  • Page 76 WAN Radio Configure the WiFi module's connectivity. BT On/Off Enable/disable the bluetooth. PS2 Y-Cable Enable the PS2 Y-Cable or set this option to Auto.

  • Page 77: Storage Configuration

    B550M Steel Legend 4.4.3 Storage Configuration SATA Mode AHCI: Supports new features that improve performance. RAID: Combine multiple disk drives into a logical unit. SATA Hot Plug Enable/disable the SATA Hot Plug function.

  • Page 78: Acpi Configuration

    4.4.4 ACPI Configuration Suspend to RAM It is recommended to select auto for ACPI S3 power saving. Deep Sleep Configure deep sleep mode for power saving when the computer is shut down. PS/2 Keyboard S4/S5 Wakeup Support Allow the system to be waked up by a PS/2 Keyboard in S4/S5. USB Keyboard/Mouse Power On Allow the system to be waked up by an USB Keyboard/Mouse device.

  • Page 79: Trusted Computing

    B550M Steel Legend 4.4.5 Trusted Computing Security Device Support Enable or disable BIOS support for security device.

  • Page 80: Amd Cbs

    4.4.6 AMD CBS The AMD CBS menu accesses AMD specific features.

  • Page 81: Amd Pbs

    B550M Steel Legend 4.4.7 AMD PBS The AMD PBS menu accesses AMD specific features.

  • Page 82: Amd Overclocking

    4.4.8 AMD Overclocking The AMD Overclocking menu accesses options for configuring CPU frequency and voltage.

  • Page 83: Tools

    B550M Steel Legend 4.5 Tools Easy RAID Installer Easy RAID Installer helps you to copy the RAID driver from the support CD to your USB storage device. After copying the drivers please change the SATA mode to RAID, then you can start installing the operating system in RAID mode.

  • Page 84: Hardware Health Event Monitoring Screen

    4.6 Hardware Health Event Monitoring Screen This section allows you to monitor the status of the hardware on your system, including the parameters of the CPU temperature, motherboard temperature, fan speed and voltage. CPU FAN1 Setting Select a fan mode for CPU Fan 1, or choose Customize to set 5 CPU temperatures and assign a respective fan speed for each temperature.
  • Page 85 B550M Steel Legend CPU Fan 2 Temp Source Select a fan temperature source for CPU Fan 2. CHA_FAN1/WP Switch Select CHA_FAN1 or Water Pump mode. Chassis Fan 1 Control Mode Select PWM mode or DC mode for Chassis Fan 1 .
  • Page 86 Chassis Fan 3 Temp Source Select a fan temperature source for Chassis Fan 3. CHA_FAN4/WP Switch Select CHA_FAN4 or Water Pump mode. Chassis Fan 4 Control Mode Select PWM mode or DC mode for Chassis Fan 4. Chassis Fan 4 Setting Select a fan mode for Chassis Fan 4, or choose Customize to set 5 CPU temperatures and assign a respective fan speed for each temperature.

  • Page 87: Security Screen

    B550M Steel Legend 4.7 Security Screen In this section you may set or change the supervisor/user password for the system. You may also clear the user password. Supervisor Password Set or change the password for the administrator account. Only the administrator has authority to change the settings in the UEFI Setup Utility.

  • Page 88: Boot Screen

    4.8 Boot Screen This section displays the available devices on your system for you to configure the boot settings and the boot priority. Boot From Onboard LAN Allow the system to be waked up by the onboard LAN. Setup Prompt Timeout Configure the number of seconds to wait for the setup hot key.
  • Page 89 B550M Steel Legend CSM (Compatibility Support Module) Enable to launch the Compatibility Support Module. Please do not disable unless you’re running a WHCK test. Launch PXE OpROM Policy Select UEFI only to run those that support UEFI option ROM only. Select Legacy only to run those that support legacy option ROM only.
  • Page 90 AddOn ROM Display Enable AddOn ROM Display to see the AddOn ROM messages or configure the Ad- dOn ROM if you’ve enabled Full Screen Logo. Disable for faster boot speed.

  • Page 91: Exit Screen

    B550M Steel Legend 4.9 Exit Screen Save Changes and Exit When you select this option the following message, “Save configuration changes and exit setup?” will pop out. Select [OK] to save changes and exit the UEFI SETUP UTILITY. Discard Changes and Exit When you select this option the following message, “Discard changes and exit...
  • Page 92 Contact Information If you need to contact ASRock or want to know more about ASRock, you’re welcome to visit ASRock’s website at http://www.asrock.com; or you may contact your dealer for further information. For technical questions, please submit a support request form at https://event.asrock.com/tsd.asp...
  • Page 93 13848 Magnolia Ave, Chino, CA91710 Phone/Fax No: +1-909-590-8308/+1-909-590-1026 hereby declares that the product Product Name : Motherboard B550M Steel Legend Model Number : Conforms to the following speci cations: FCC Part 15, Subpart B, Unintentional Radiators Supplementary Information: is device complies with part 15 of the FCC Rules. Operation is subject to the...
  • Page 94 EU Declaration of Conformity For the following equipment: Motherboard (Product Name) B550M Steel Legend/ ASRock (Model Designation / Trade Name) ASRock Incorporation (Manufacturer Name) 2F., No.37, Sec. 2, Jhongyang S. Rd., Beitou District, Taipei City 112, Taiwan (R.O.C.) (Manufacturer Address) EMC —Directive 2014/30/EU (from April 20th, 2016)

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