We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Green micro ATX board with black slots and silver heatsinks

ASRock

ASRock B450M/AC R2.0 AMD AM4 Micro ATX motherboard

SKU CH-ZD6B-9AGK9 MPN B450M/AC R2.0

Micro ATX board with AM4 socket for Ryzen 2000, 3000 and 5000 CPUs, four DDR4 slots up to 128 GB, Ultra M.2 Gen3 x4, 802.11ac Wi-Fi, Realtek 7.1 audio and HDMI 1.4

  • CPU Socket TypeAM4
  • CPU TypeSupports AMD AM4 Socket Ryzen 2000, 3000 and 5000 Series Des
  • ChipsetAMD Promontory B450
  • Number of Memory Slots4x288pin (DDR4)
  • Memory StandardAMD Ryzen series CPUs (Matisse) support DDR4 3200/ 2933/ 266
  • Maximum Memory Supported128GB ** Due to the operating system limitation, the actual
  • Supports Ryzen 2000, 3000 and 5000 Series processors
  • Four DDR4 slots accept up to 128GB memory
  • Ultra M.2 socket delivers Gen3 x4 speeds up to 32Gb/s
  • Realtek ALC892/897 provides 7.1 channel HD audio
  • Built-in WiFi-802.11ac module uses vertical M.2 Key E slot

AM4 Micro ATX for Ryzen 2000 3000 5000

The ASRock B450M/AC R2.0 is a Micro ATX motherboard built around the AMD Promontory B450 chipset and AM4 socket. It supports Ryzen 2000 3000 and 5000 series desktop processors. Four DDR4 slots accept up to 128GB of memory in dual channel mode. Onboard WiFi 802.11ac is included via a vertical M.2 Key E module.

Upgrade from A320 or first gen Ryzen boards

Moving from an A320 board adds CPU overclocking headroom and native support for Ryzen 5000 series without a BIOS flash on older stock. The jump is worth it when you need 3200+(OC) memory speeds on Matisse or Summit Ridge CPUs or want the Ultra M.2 slot running at Gen3 x4 with those processors.

PCIe 3.0 x4 M.2 and SATA 6.0Gb/s limits

The Ultra M.2 socket delivers up to 32Gb/s with Matisse Picasso Summit Ridge Raven Ridge or Pinnacle Ridge CPUs but drops to 16Gb/s with Athlon series. Four SATA3 ports provide 6.0Gb/s each and support RAID 0 1 10. Graphics output relies on the APU and is limited to HDMI 1.4 at 4K 30Hz.

Highlights

  • Supports Ryzen 2000, 3000 and 5000 Series processors
  • Four DDR4 slots accept up to 128GB memory
  • Ultra M.2 socket delivers Gen3 x4 speeds up to 32Gb/s
  • Realtek ALC892/897 provides 7.1 channel HD audio
  • Built-in WiFi-802.11ac module uses vertical M.2 Key E slot

Specifications

BrandASRock
ModelB450M/AC R2.0
CPU Socket TypeAM4
CPU TypeSupports AMD AM4 Socket Ryzen 2000, 3000 and 5000 Series Desktop Processors
ChipsetAMD Promontory B450
Number of Memory Slots4x288pin (DDR4)
Memory StandardAMD Ryzen series CPUs (Matisse) support DDR4 3200/ 2933/ 2667/ 2400/ 2133 ECC & non-ECC, un-buffered memory*
AMD Ryzen series CPUs (Pinnacle Ridge) support DDR4 3200+(OC)/ 2933(OC)/ 2667/ 2400/ 2133 ECC & non-ECC, un-buffered memory*
AMD Ryzen series CPUs (Picasso) support DDR4 2933/ 2667/ 2400/ 2133 non-ECC, un-buffered memory*
AMD Ryzen series CPUs (Summit Ridge) support DDR4 3200+(OC)/ 2933(OC)/ 2667/ 2400/ 2133 ECC & non-ECC, un-buffered memory*
AMD Ryzen series CPUs (Raven Ridge) support DDR4 3200+(OC)/ 2933/ 2667/ 2400/ 2133 non-ECC, un-buffered memory*
* For Ryzen Series CPUs
Maximum Memory Supported128GB
** 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 SupportedDual Channel
Memory Performance ProfileIntel XMP 2.0
PCI Express 3.0 x16AMD Ryzen series CPUs (Matisse, Summit Ridge and Pinnacle Ridge)
- 1 x PCI Express 3.0 x16 Slot (PCIE1: x16 mode)*
AMD Ryzen series CPUs (Picasso, Raven Ridge)
- 1 x PCI Express 3.0 x16 Slot (PCIE1: x8 mode)*
AMD Athlon series CPUs
- 1 x PCI Express 3.0 x16 Slot (PCIE1: x4 mode)*
* Supports NVMe SSD as boot disks
PCI Express 2.0 x16AMD Ryzen series CPUs (Summit Ridge and Pinnacle Ridge)
- 1 x PCI Express 2.0 x16 Slot (PCIE2: x4 mode)
AMD Ryzen series CPUs (Raven Ridge)
- 1 x PCI Express 2.0 x16 Slot (PCIE2: x4 mode)
AMD Athlon series CPUs
- 1 x PCI Express 2.0 x16 Slot (PCIE2: x4 mode)
Other Slots1 x Vertical M.2 Socket (Key E) with the bundled WiFi-802.11ac module (on the rear I/O)
Serial ATA (SATA)4 x SATA3 6.0Gb/s Connectors, support RAID, NCQ, AHCI and Hot Plug
M.21 x Ultra M.2 Socket (M2_1), supports M Key type 2242/2260/2280 M.2 PCI Express module up to Gen3 x4 (32Gb/s) (with Matisse, Picasso, Summit Ridge, Raven Ridge and Pinnacle Ridge) or Gen3 x2 (16Gb/s) (with Athlon series APU)*
* Supports NVMe SSD as boot disks
* Supports ASRock U.2 Kit
SATA RAID0/1/10
Onboard Video ChipsetIntegrated 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.**
Supports HDMI 1.4 with max. resolution up to 4K x 2K (4096x2160) @ 24Hz / (3840x2160) @ 30Hz
Supports Auto Lip Sync, Deep Color (12bpc), xvYCC and HBR (High Bit Rate Audio) with HDMI 1.4 Port (Compliant HDMI monitor is required)
Supports HDCP 1.4 with HDMI 1.4 Port
Supports 4K Ultra HD (UHD) playback with HDMI 1.4 Port
* Actual support may vary by CPU
** The Max shared memory 16GB requires 32GB system memory installed
Audio ChipsetRealtek ALC892/897
Audio Channels7.1 CH HD Audio with Content Protection
Supports Surge Protection
LAN ChipsetRealtek RTL8111H
Max LAN Speed1Gbps
Wireless LANIntel 802.11 ac Wi-Fi Module
Supports IEEE 802.11 a/b/g/n/ac
Supports Dual-Band (2.4/5 GHz)
Supports high speed wireless connections up to 433 Mbps
BluetoothBluetooth 4.2 / 3.0 + High speed class II
Back I/O Ports2 x Antenna Ports
1 x HDMI Port
2 x USB 2.0 Ports (Supports ESD Protection)
4 x USB 3.2 Gen1 Ports (Supports ESD Protection)
1 x RJ-45 LAN Port with LED (ACT/LINK LED and SPEED LED)
HD Audio Jacks: Line in / Front Speaker / Microphone
Onboard USB2 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)
Other Connectors1 x Chassis Intrusion Header
1 x Power LED and Speaker Header
1 x RGB LED Header*
1 x Addressable LED Header**
1 x AMD Fan LED Header***
1 x CPU Fan Connector (4-pin)****
1 x Chassis Fan Connector (3-pin)*****
1 x Chassis/Water Pump Fan Connector (4-pin) (Smart Fan Speed Control)******
1 x Front Panel Audio Connector
1 x AMD LED Fan USB Header
*Supports in total up to 12V/3A, 36W LED Strip.
**Supports in total up to 5V/3A, 15W LED Strip.
***The AMD Fan LED Header supports LED strips of maximum load of 3A (36W) and length up to 2.5M.
****The CPU Fan Connector supports the CPU fan of m
Form FactorMicro ATX
LED LightingNone RGB
Dimensions (W x L)9.6" x 9.6"
Power Pin1 x 24-pin ATX Power Connector
1 x 8-pin 12V Power Connector
Windows 11Supported
FeaturesUnique Feature:
ASRock Super Alloy
- Premium 42A Power Choke
- Sapphire Black PCB
- High Density Glass Fabric PCB
- 2oz Copper PCB
Intel 802.11ac WiFi
ASRock Ultra M.2 (PCIe Gen3 x4)
ASRock Full Spike Protection (for all USB, Audio, LAN Ports)
ASRock Live Update & APP Shop
BIOS:
- 128MB AMI UEFI Legal BIOS with multilingual GUI support
- Supports "Plug and Play"
- ACPI 5.1 compliance wake up events
- Supports jumperfree
- SMBIOS 2.3 support
- DRAM Voltage multi-adjustment
Software and UEFI:
Software
- ASRock A-Tuning
- ASRock Polychrome SYNC
- ASRock XFast LAN
UEFI
- ASRock Full HD U
Package ContentsAccessories:
- Quick Installation Guide, Support CD, I/O Shield
- 2 x SATA Data Cables
- 2 x ASRock Wi-Fi 2.4/5 GHz Antennas
- 1 x Screw for M.2 Socket
Shipping weight1.18 kg
Package size275 × 260 × 60 mm

Questions about this item

What case and power supply clearances are required for the Micro ATX B450M/AC R2.0 board?

The board uses the Micro ATX form factor with a standard 24-pin ATX power connector and an 8-pin CPU power connector. It fits any case that supports Micro ATX mounting holes and provides room for the rear I/O shield.

Which BIOS step is often missed when installing a Ryzen 5000 series processor on this AM4 socket?

The board must run a BIOS version that includes support for Ryzen 5000 series CPUs. If the installed BIOS is older, the system will not post until the firmware is updated using a supported Matisse, Summit Ridge or Pinnacle Ridge processor.

How long does the bundled WiFi-802.11ac module in the vertical M.2 Key E socket typically last before replacement?

The soldered WiFi module has no specified service interval. If wireless performance degrades, the module cannot be swapped individually; a USB WiFi adapter or PCIe card would be used instead.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.