ASROCK B660 Steel Legend User manual

Version 1.0
Published December 2021
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e Lithium battery adopted on this motherboard contains Perchlorate, a toxic substance
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“Perchlorate Material-special handling may apply, see www.dtsc.ca.gov/hazardouswaste/
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B660 Steel Legend
Motherboard Layout

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No. Description
1 ATX 12V Power Connector (ATX12V1)
2 CPU Fan Connector (CPU_FAN1)
3 2 x 288-pin DDR4 DIMM Slots (DDR4_A1, DDR4_B1)
4 2 x 288-pin DDR4 DIMM Slots (DDR4_A2, DDR4_B2)
5 Chassis/Water Pump Fan Connector (CHA_FAN3/WP)
6 CPU/Water Pump Fan Connector (CPU_FAN2/WP)
7 Addressable LED Header (ADDR_LED3)
8 Addressable LED Header (ADDR_LED2)
9 ATX Power Connector (ATXPWR1)
10 Front Panel Type C USB 3.2 Gen2x2 Header (F_USB32_TC_1)
11 USB 3.2 Gen1 Header (USB3_5_6)
12 SATA3 Connector (SATA3_A2)
13 SATA3 Connector (SATA3_A1)
14 SATA3 Connector (SATA3_3)
15 SATA3 Connector (SATA3_2)
16 Chassis/Water Pump Fan Connector (CHA_FAN5/WP)
17 Post Status Checker (PSC)
18 Chassis/Water Pump Fan Connector (CHA_FAN4/WP)
19 SATA3 Connector (SATA3_1)
20 SATA3 Connector (SATA3_0)
21 System Panel Header (PANEL1)
22 Clear CMOS Jumper (CLRMOS1)
23 Chassis/Water Pump Fan Connector (CHA_FAN2/WP)
24 USB 2.0 Header (USB_3_4)
25 Chassis Intrusion and Speaker Header (SPK_CI1)
26 SPI TPM Header (SPI_TPM_J1)
27 RGB LED Header (RGB_LED1)
28 Addressable LED Header (ADDR_LED1)
29 Front Panel Audio Header (HD_AUDIO1)
30 Chassis/Water Pump Fan Connector (CHA_FAN1/WP)

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B660 Steel Legend
I/O Panel
No. Description No. Description
1 USB 2.0 Ports (USB_1_2) 9 USB 3.2 Gen1 Ports (USB3_3_4)
2 2.5G LAN RJ-45 Port* 10 USB 3.2 Gen1 Ports (USB3_1_2)
3 Central / Bass (Orange) 11 BIOS Flashback Button
4 Rear Speaker (Black) 12 USB 3.2 Gen2 Type-C Port (USB31_TC_1)
5 Line In (Light Blue) 13 DisplayPort 1.4
6 Front Speaker (Lime)** 14 HDMI Port
7 Microphone (Pink) 15 PS/2 Mouse/Keyboard Port
8 Optical SPDIF Out Port
14 9
15
2
11
12
13
1
78
4
3
6
5
10
ACT/LINK LED
SPEED LED
LAN Port
* ere are two LEDs on each LAN port. Please refer to the table below for the LAN port LED indications.
Activity / Link LED Speed LED
Status Description Status Description
O No Link O 10Mbps connection
Blinking Data Activity Orange 100Mbps/1Gbps connection
On Link Green 2.5Gbps connection
** If you use a 2-channel speaker, please connect the speaker’s plug into “Front Speaker Jack”. See the table below
for connection details in accordance with the type of speaker you use.
Audio Output
Channels
Front Speaker
(No. 6)
Rear Speaker
(No. 4)
Central / Bass
(No. 3)
Line In
(No. 5)
2V -- -- --
4V V -- --
6V V V --
8V V V V

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Chapter 1 Introduction
ank you for purchasing ASRock B660 Steel Legend motherboard, a reliable
motherboard produced under ASRock’s consistently stringent quality control.
It delivers excellent performance with robust design conforming to ASRock’s
commitment to quality and endurance.
1.1 Package Contents
• ASRock B660 Steel Legend Motherboard (ATX Form Factor)
• ASRock B660 Steel Legend Quick Installation Guide
• ASRock B660 Steel Legend Support CD
• 2 x Serial ATA (SATA) Data Cables (Optional)
• 4 x Screws for M.2 Sockets (Optional)
• 1 x Stando for M.2 Socket (Optional)
• 1 x I/O Panel Shield
Because the motherboard specications and the BIOS soware might be updated, the
content of this documentation will be subject to change without notice. In case any
modications of this documentation occur, the updated version will be available on
ASRock’s website without further notice. If you require technical support related to
this motherboard, please visit our website for specic information about the model
you are using. You may nd the latest VGA cards and CPU support list on ASRock’s
website as well. ASRock website http://www.asrock.com.

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B660 Steel Legend
1.2 Specications
Platform • ATX Form Factor
• 2oz Copper PCB
CPU • Supports 12th Gen Intel® CoreTM Processors (LGA1700)
• Digi Power design
• 9 Power Phase design
• Supports Intel® Hybrid Technology
• Supports Intel® Turbo Boost Max 3.0 Technology
Chipset • Intel® B660
Memory • Dual Channel DDR4 Memory Technology
• 4 x DDR4 DIMM Slots
• Supports DDR4 non-ECC, un-buered memory up to
5000+(OC)*
* Supports DDR4 3200 natively.
* Please refer to Memory Support List on ASRock's website for
more information. (http://www.asrock.com/)
• Supports ECC UDIMM memory modules (operate in non-
ECC mode)
• Max. capacity of system memory: 128GB
• Supports Intel® Extreme Memory Prole (XMP) 2.0
• 15μ Gold Contact in DIMM Slots
Expansion
Slot
• 2 x PCIe x16 Slots (PCIE1/PCIE3: single at Gen5x16 (PCIE1);
dual at Gen5x16 (PCIE1) / Gen4x2 (PCIE3))*
* Supports NVMe SSD as boot disks
• 2 x PCIe Gen3x1 Slots
• 1 x M.2 Socket (Key E), supports type 2230 WiFi/BT PCIe
WiFi module and Intel® CNVi (Integrated WiFi/BT)
• 15μ Gold Contact in VGA PCIe Slot (PCIE1)
Graphics • Intel® UHD Graphics Built-in Visuals and the VGA outputs
can be supported only with processors which are GPU
integrated.
• Intel® XeGraphics Architecture (Gen 12)
• Dual graphics output: support HDMI and DisplayPort 1.4
ports by independent display controllers

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• Supports HDMI 2.1 TMDS Compatible with max. resolution
up to 4K x 2K (4096x2160) @ 60Hz
• Supports DisplayPort 1.4 with DSC (compressed) max.
resolution up to 8K (7680x4320) @ 60Hz / 5K (5120x3200) @
120Hz
• Supports HDCP 2.3 with HDMI 2.1 TMDS Compatible and
DisplayPort 1.4 Ports
Audio • 7.1 CH HD Audio (Realtek ALC897 Audio Codec)
• Supports Surge Protection
• Gold Audio Jacks
• 15μ Gold Audio Connector
• Nahimic Audio
LAN • 2.5 Gigabit LAN 10/100/1000/2500 Mb/s
• Dragon RTL8125BG
• Supports Dragon 2.5G LAN Soware
- 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
• Supports Energy Ecient Ethernet 802.3az
• Supports PXE
Rear Panel
I/O
• 2 x Antenna Mounting Points
• 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-C Port (10 Gb/s) (ReDriver) (Supports
ESD Protection)
• 4 x USB 3.2 Gen1 Ports (ASMedia ASM1074 hub) (Supports
ESD Protection)
• 2 x USB 2.0 Ports (Supports ESD Protection)
• 1 x RJ-45 LAN Port with LED (ACT/LINK LED and SPEED
LED)
• 1 x BIOS Flashback Button

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B660 Steel Legend
• HD Audio Jacks: Rear Speaker / Central / Bass / Line in /
Front Speaker / Microphone (Gold Audio Jacks)
Storage • 4 x SATA3 6.0 Gb/s Connectors*
* If M2_2 is occupied by a SATA-type M.2 device, SATA3_0 will
be disabled.
• 2 x SATA3 6.0 Gb/s Connectors by ASMedia ASM1061
• 1 x Hyper M.2 Socket (M2_1, Key M), supports type
2260/2280 PCIe Gen4x4 (64 Gb/s) mode**
• 1 x M.2 Socket (M2_2, Key M), supports type 2260/2280
SATA3 6.0 Gb/s & PCIe Gen3x2 (16 Gb/s) modes**
• 1 x Hyper M.2 Socket (M2_3, Key M), supports type
2260/2280/22110 PCIe Gen4x4 (64 Gb/s) modes**
** Supports Intel® OptaneTM Technology (M2_3 only)
** Supports Intel® Volume Management Device (VMD)
** Supports NVMe SSD as boot disks
** Supports ASRock U.2 Kit
RAID • Supports RAID 0, RAID 1, RAID 5 and RAID 10 for SATA
storage devices
Connector • 1 x SPI TPM Header
• 1 x Chassis Intrusion and Speaker Header
• 1 x RGB LED Header
* Supports in total up to 12V/3A, 36W LED Strip
• 3 x Addressable LED Headers
* Support in total up to 5V/3A, 15W LED Strip
• 1 x CPU Fan Connector (4-pin)
* e CPU Fan Connector supports the CPU fan of maximum
1A (12W) fan power.
• 1 x CPU/Water Pump Fan Connector (4-pin) (Smart Fan
Speed Control)
* e CPU/Water Pump Fan supports the water cooler fan of
maximum 2A (24W) fan power.
• 5 x Chassis/Water Pump Fan Connectors (4-pin) (Smart Fan
Speed Control)
* e Chassis/Water Pump Fan supports the water cooler fan of
maximum 2A (24W) fan power.
* CPU_FAN2/WP and CHA_FAN1~5/WP can auto detect if
3-pin or 4-pin fan is in use.

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• 1 x 24 pin ATX Power Connector (Hi-Density Power Con-
nector)
• 1 x 8 pin 12V Power Connector (Hi-Density Power Connec-
tor)
• 1 x Front Panel Audio Connector (15μ Gold Audio Connec-
tor)
• 1 x USB 2.0 Header (Supports 2 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 Gen2x2 Header (20 Gb/s)
(Supports ESD Protection)
BIOS
Feature
• AMI UEFI Legal BIOS with multilingual GUI support
• ACPI 6.0 Compliant wake up events
• SMBIOS 2.7 Support
• CPU Core/Cache, CPU GT, DRAM, VDD_IMC ,VCCIN
AUX, +1.05V PROC, +1.8V PROC, +0.82V PCH, +1.05V
PCH Voltage Multi-adjustment
Hardware
Monitor
• Fan Tachometer: CPU, CPU/Water Pump, Chassis/Water
Pump Fans
• Quiet Fan (Auto adjust chassis fan speed by CPU tempera-
ture): CPU, CPU/Water Pump, Chassis/Water Pump Fans
• Fan Multi-Speed Control: CPU, CPU/Water Pump, Chassis/
Water Pump Fans
• CASE OPEN detection
• Voltage monitoring: CPU Vcore, PCH, DRAM, VCCIN AUX,
VCCSA, +1.05V PROC, +0.82V PCH, +12V, +5V, +3.3V
OS • Microso® Windows® 10 64-bit / 11 64-bit
Certica-
tions
• FCC, CE
• ErP/EuP ready (ErP/EuP ready power supply is required)
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. Overclocking may aect your system’s stability, or
even cause damage to the components and devices of your system. It should be done
at your own risk and expense. We are not responsible for possible damage caused by
overclocking.
* For detailed product information, please visit our website: http://www.asrock.com

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B660 Steel Legend
is is an ATX form factor motherboard. Before you install the motherboard, study
the conguration of your chassis to ensure that the motherboard ts into it.
Pre-installation Precautions
Take note of the following precautions before you install motherboard components
or change any motherboard settings.
• Make sure to unplug the power cord before installing or removing the motherboard
components. Failure to do so may cause physical injuries and damages to motherboard
components.
• In order to avoid damage from static electricity to the motherboard’s components,
NEVER place your motherboard directly on a carpet. Also remember to use a grounded
wrist strap or touch a safety grounded object before you handle the components.
• Hold components by the edges and do not touch the ICs.
• Whenever you uninstall any components, place them on a grounded anti-static pad or
in the bag that comes with the components.
• When placing screws to secure the motherboard to the chassis, please do not over-
tighten the screws! Doing so may damage the motherboard.
Chapter 2 Installation

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2.1 Installing the CPU
1. Before you insert the 1700-Pin CPU into the socket, please check if the PnP cap
is on the socket, if the CPU surface is unclean, or if there are any bent pins in the
socket. Do not force to insert the CPU into the socket if above situation is found.
Otherwise, the CPU will be seriously damaged.
2. Unplug all power cables before installing the CPU.
1
A
B
2 3

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B660 Steel Legend
5
76
4

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Please save and replace the cover if the processor is removed. e cover must be
placed if you wish to return the motherboard for aer service.

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B660 Steel Legend
2.2 Installing the CPU Fan and Heatsink
1 2
CPU_FAN

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2.3 Installing Memory Modules (DIMM)
is motherboard provides four 288-pin DDR4 (Double Data Rate 4) DIMM slots,
and supports Dual Channel Memory Technology.
Dual Channel Memory Conguration
e DIMM only ts 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.
Priority DDR4_A1 DDR4_A2 DDR4_B1 DDR4_B2
1Populated Populated
2Populated Populated Populated Populated
1. For dual channel conguration, you always need to install identical (the same
brand, speed, size and chip-type) DDR4 DIMM pairs.
2. It is unable to activate Dual Channel Memory Technology with only one or three
memory module installed.
3. It is not allowed to install a DDR, DDR2 or DDR3 memory module into a DDR4
slot; otherwise, this motherboard and DIMM may be damaged.

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B660 Steel Legend
1
2
3

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2.4 Expansion Slots (PCIe Slots)
ere are 4 PCIe slots on the motherboard.
PCIe slots:
PCIE1 (PCIe 5.0 x16 slot) is used for PCIe x16 lane width graphics cards.
PCIE2 (PCIe 3.0 x1 slot) is used for PCIe x1 lane width cards.
PCIE3 (PCIe 4.0 x16 slot) is used for PCIe x2 lane width graphics cards.
PCIE4 (PCIe 3.0 x1 slot) is used for PCIe x1 lane width cards.
Before installing an expansion card, please make sure that the power supply is
switched o 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.
For a better thermal environment, please connect a chassis fan to the motherboard’s
chassis fan connector (CHA_FAN1~5/WP) when using multiple graphics cards.