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

  • ProcessorSupports AMD AM4 Socket Ryzen 2000, 3000 and 5000 Series Des
  • ChipsetAMD Promontory B450
  • Form factorMicro ATX
  • CPU socketAM4
  • Memory slot count4 × 288pin (DDR4)
  • Supported memoryAMD Ryzen series CPUs (Matisse) support DDR4 3200/ 2933/ 266
  • 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.

How it compares

Measured against everything we stock in Motherboards for AMD CPUs, at today’s prices. Recalculated every night.

Price $68.99
Cheaper than about 86% of the 1,906 comparable items (median $224.49).

New to this? Buying PC parts with Monero — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameASRock
Model nameB450M/AC R2.0
Processor
ProcessorSupports AMD AM4 Socket Ryzen 2000, 3000 and 5000 Series Desktop Processors
CPU socketAM4
ChipsetAMD Promontory B450
Memory
Memory slot count4 × 288pin (DDR4)
Supported memoryAMD 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
Memory channelsDual Channel
Memory profilesIntel XMP 2.0
Storage
SATA ports4 x SATA3 6.0Gb/s Connectors, support RAID, NCQ, AHCI and Hot Plug
M.2 slots1 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 and RAID support0/1/10
Audio & video
Audio chipRealtek ALC892/897
Sound channels7.1 CH HD Audio with Content Protection
Supports Surge Protection
Connectivity
Ethernet controllerRealtek RTL8111H
Maximum network speed1 Gbit/s
Wi-Fi standardIntel 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 Mbit/s
Bluetooth support4.2 / 3.0 + High speed class II
Ports & slots
Additional slots1 x Vertical M.2 Socket (Key E) with the bundled WiFi-802.11ac module (on the rear I/O)
Rear panel 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 USB headers2 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)
Power
Power connectors1 × 24-pin ATX Power Connector
1 × 8-pin 12 V Power Connector
Size & build
Form factorMicro ATX
Width and length9.6 in × 9.6 in
Shipping weight1.18 kg
Package size275 × 260 × 60 mm
Compatibility
Windows 11 supportSupported
In the box
In the boxAccessories:
- 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
More details
LightingNone RGB

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.

More in Motherboards for AMD CPUs

Similar items