ASUS B660M-A AC D4 Overview
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1Description
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2Intelligent Control
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3UEFI Bios
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4Cooling
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5Robust Power Design
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6Connectivity
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7Customization
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8DIY Friendly
Utilize the power of the Intel 12th generation processors in a small form factor with the PRIME B660M-A AC D4 Micro-ATX Motherboard from ASUS. Designed to boost system performance whether you are building a gaming system or looking to streamline content creation, the B660M-A gives you ample power to complete important tasks efficiently. Laying the foundation of this motherboard is the Intel B660 chipset, giving you access to an LGA 1700 socket.
This motherboard features four DDR4 RAM slots, six SATA II ports, and two M.2 storage interfaces. Equip your system with an array of graphics and utility cards using the onboard PCIe 4.0 x16 slot and three PCIe 3.0 x16 slots. USB 2.0 ports allow you to connect a wide range of peripherals from keyboards, mice, and game controllers, while USB 3.2 Gen 2 ports give you enhanced connectivity speeds suitable for more resource-demanding devices such as interfaces and external storage drives. Connect wireless peripherals such as headphones thanks to support for Bluetooth 5.1. If you are relying on integrated graphics from the processor with this motherboard, you can connect displays to the two HDMI or single DisplayPort outputs. Wi-Fi 5 (802.11ac) capabilities allow you to easily connect to your home or business' wireless network while an RJ45 Gigabit Ethernet port offers a hard-wired connection that is suitable for competitive online gaming or uploading content online.
All-Around Energy Efficiency
The Energy Processing Unit (EPU) automatically optimizes power consumption and maximizes energy savings with Away mode, a smart setting that creates an extreme energy-saving scenario by shutting down unused I/O controller.
ASUS Fan Xpert 2+ software provides comprehensive control over fans, water pumps, and all-in-one (AiO) coolers. Whether cooling with air or water, an Auto-Tuning mode intelligently configures all parameters with a single click. There's also an Extreme quiet mode that reduces all fan speeds to below the default minimum to keep your system whisper-quiet when performing light tasks. Fans, water pumps, and AiO coolers can also be controlled via the UEFI BIOS.
The Digi+ voltage-regulator module (VRM) delivers real-time control over voltage droop, automatically switching frequency and power-efficiency settings. It also allows you to fine-tune your CPU for ultimate stability and performance.
An advanced mode offered via the UEFI lets you take complete control. A built-in search feature makes it easy to find options, and various advanced functions let you intelligently make nuanced adjustments so you can dial in performance just the way you want.
EZ mode displays vital settings and stats and also offers guided wizards, drag-and-drop functionality, and one-click application of important settings, all to help you get your system up and running in no time.
The M.2 heatsink wards off throttling that can occur with M.2 storage during sustained transfers. The heatsink is held in place by captive screws for simple installation.
VRM Heatsink and Thermal Pad
The VRM heatsink and thermal pad improve heat transfer from the MOSFETs and chokes for better cooling performance.
The Prime B660 series motherboards feature comprehensive cooling controls that are configurable via Fan Xpert 2+ software or via the UEFI BIOS. Each cooling header can dynamically reference three thermal sensors. Fan Xpert 2+ allows you to map the temperature of supported ASUS graphics cards to optimize cooling for GPU- and CPU-intensive tasks. There is a dedicated integrated circuit to protect each fan header from overheating and overcurrent, while each onboard header supports auto-detection of PWM or DC fans.
A proprietary connector augments the motherboard's link to the PSU with 8-pin connector that passes 12 volts of power directly to the processors. Each jack features solid pins that can handle more current than hollow-pin connectors.
Improvements to trace routing design provide the latest Intel processors with enhanced access to memory bandwidth, allowing you to take full advantage of DDR4-5333 MHz overclocked RAM.
ASUS OptiMem II technology carefully maps memory signal pathways across different PCB layers to reduce vias and add shielding zones that significantly reduce crosstalk.
This motherboard offers two M.2 slots that support data-transfer speeds of up to 64 Gb/s via PCIe 4.0, enabling quicker boot-up and application load times with OS or application drives.
DRAM Overcurrent Protection
Onboard resettable fuses prevent overcurrent and short-circuit damage. This extends beyond I/O ports to DRAM to safeguard the lifespan of your system and connected devices.
An exclusive circuit design with built-in voltage regulators to protect your motherboard from damage caused by unexpected high-level voltages from unstable or inferior power supplies.
ASUS LANGuard is a hardware-level network protection feature that integrates advanced signal-coupling technology and premium anti-EMI surface-mounted capacitors to improve throughput and ensure a more reliable connection.
This motherboard is designed specifically for 12th Generation Intel Core CPUs and offers PCIe 4.0 connectivity for the latest GPUs. The wide bandwidth and superfast transmission speeds allow you to create feature-rich builds that can handle high loads seamlessly.
Numerous USB ports support high-end systems loaded with peripherals, including the front USB Type-C connectors with USB 3.2 Gen 1 for transmission speeds of up to 5 Gb/s.
ASUS Aura Sync offers full RGB lighting control with a variety of functional presets for the built-in RGB LEDs as well as strips and devices connected to the onboard RGB headers, and it can all be synced with an ever-growing portfolio of Aura-capable hardware.
Addressable Gen 2 Headers
Three addressable Gen 2 headers are capable of detecting the number of LEDs on second-gen addressable RGB devices, allowing the software to automatically tailor lighting effects to specific devices. The new headers also offer backward-compatibility with existing Aura RGB gear.
Armoury Crate is a software utility designed to give you centralized control of supported products. From a single intuitive interface, Armoury Crate allows you to easily customize RGB lighting and effects for every compatible device in your arsenal. The software also provides you with control of settings for an ever-growing number of ASUS products, including keyboard and mouse preferences. Armoury Crate even features dedicated product registration and news to help you stay in touch with the ASUS community.
The Q-LED Core display produces light patterns by power LED during the Power-On Self-Test (POST) that can help users troubleshoot potential issues.
SafeSlot Core+ is the ASUS-exclusive PCIe slot fortified with a one-piece stainless-steel brace that shields the slot to protect it from damage. The metal cover is tightly secured to the slot with hooks, and the entire assembly is firmly anchored to the PCB with strengthened solder points to provide a secure foundation for heavyweight graphics cards.
The corrosion-resistant stainless-steel back I/O panel bonded with chromium oxide has a lifespan that's three times longer than ordinary I/O panels.
In the Box
- ASUS PRIME B660M-A AC D4 Micro-ATX Motherboard
- 2 x SATA III Cables
- ASUS Wi-Fi Moving Antennas
- I/O Shield
- M.2 Rubber Package
- M.2 SSD Screw Package
- Limited 3-Year Manufacturer Warranty
Table of Contents
- Description
- Intelligent Control
- UEFI Bios
- Cooling
- Robust Power Design
- Connectivity
- Customization
- DIY Friendly
ASUS B660M-A AC D4 Specs
CPU
Chipset |
Intel B660 |
CPU Socket |
LGA 1700 |
Back Panel I/O
USB |
2 x USB-A (USB 3.1/3.2 Gen 2) 4 x USB-A (USB 2.0) |
Thunderbolt |
None |
Display |
1 x DisplayPort 1.4 2 x HDMI 2.1 |
Audio |
3 x 1/8" / 3.5 mm |
Ethernet / Controller |
1 x Intel Gigabit |
PS/2 |
1 x Combo |
Wi-Fi Antenna |
2 x Connector |
Memory
Memory Slots |
4 x 288-Pin |
Memory Support |
DDR4 2133, 2400, 2666, 2800, 2933, 3000, 3200, 3333, 3400, 3466, 3600, 3733, 4000, 4266, 4400, 4600, 4800, 5000, 5333 MHz |
Maximum Capacity |
128 GB |
Channel Architecture |
Dual Channel |
ECC Support |
Non-ECC Unbuffered |
Storage Expansion
SATA |
6 x SATA III |
M.2 |
2 x M Key 2242, 2260, 2280 (PCIe 4.0 x4) |
Optane Memory Support |
Yes |
RAID Support |
RAID 0, 1, 5, 10 (SATA) |
Internal I/O
Expansion Slots |
1 x PCIe 4.0 x16 (x16 mode) 1 x PCIe 3.0 x16 (x4 mode) 2 x PCIe 3.0 x16 (x1 mode) |
USB |
2 x 3.0 / 3.1/3.2 Gen 1 Header (Supports 4 USB-C Port) 2 x 3.0 / 3.1/3.2 Gen 1 Header (Supports 4 USB-A Port) 2 x 2.0 Header (Supports 4 USB-A Port) |
Air Cooling |
2 x 4-Pin CPU 2 x 4-Pin System |
Power Connectors |
1 x 24-Pin Mainboard 1 x 8-Pin ATX |
Security |
Chassis Intrusion, TPM Header |
LED Header |
4 x RGB |
Audio |
1 x S/PDIF |
Diagnostics |
Clear CMOS |
Legacy |
1 x Parallel 1 x Serial |
Audio
Audio Codec |
Realtek ALC897 (7.1-Channel) |
Wireless
Bluetooth |
5.1 |
Wi-Fi |
Wi-Fi 5 (802.11ac) |
Wireless |
Wi-Fi 5 (802.11ac) / Bluetooth 5.1 |
Software
OS Compatibility |
Windows 11 Windows 10 *As of January, 2022: Check with manufacturer for the most up-to-date compatibility |
Physical
Form Factor |
Micro-ATX |
Dimensions |
9.6 x 9.6" / 24.4 x 24.4 cm |
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