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Green Micro-ATX board with black heatsinks, AM4 socket, four DDR4 slots, RGB lighting

ASUS

ASUS TUF GAMING B450M-PRO S AMD motherboard AM4 3rd Gen Ryzen Micro ATX

SKU CH-K1CB-0JFFS

Micro ATX board for AM4 Ryzen CPUs with 8+2 DrMOS power, 2.5Gb LAN, BIOS FlashBack, AI noise-cancelling mic, USB 3.2 Gen 2 and AURA Sync RGB

  • ProcessorSupports 3rd / 2nd / 1st Gen AMD Ryzen Processors Supports 2
  • ChipsetAMD B450
  • Form factorMicro ATX
  • CPU socketAM4
  • Memory slot count4 × 288pin (DDR4)
  • Supported memoryDDR4 4400(OC) / 3533(OC) / 3466(OC) / 3200(OC) / 3000(OC) /
  • Ready for 3rd Gen Ryzen CPUs with AM4 socket
  • Stable power from 8+2 DrMOS stages for overclocking
  • Fast wired networking via 2.5 Gb LAN
  • Memory overclocking headroom up to DDR4 4400
  • BIOS recovery without a CPU using FlashBack

Socket AM4 Micro-ATX foundation

The ASUS TUF GAMING B450M-PRO S is a Micro-ATX motherboard built around the AMD B450 chipset and the AM4 socket. It accepts 1st, 2nd and 3rd Generation Ryzen processors as well as Athlon models with Radeon Vega graphics. Four 288-pin DDR4 slots support up to 128 GB in dual-channel mode with speeds ranging from 2133 to 4400 MHz when overclocked.

Builders who need compact expandability

This board suits system builders who want a smaller chassis without losing four memory slots, two full-length PCI Express slots and three M.2 sockets. Users planning heavy multi-GPU arrays or workstation-class I/O should look at full-size ATX or TRX40 platforms instead.

8+2 DrMOS power stages for sustained loads

The 8+2 DrMOS power-stage design delivers clean current to the CPU, making it the specification that determines whether the board can handle sustained all-core loads on higher-TDP Ryzen chips without throttling.

How it compares

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

Price $92.99
Cheaper than about 78% 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 nameASUS
Model nameTUF GAMING B450M-PRO S
Processor
ProcessorSupports 3rd / 2nd / 1st Gen AMD Ryzen Processors
Supports 2nd / 1st Gen AMD Ryzen with Radeon Vega Graphics Processors
Supports AMD Athlon with Radeon Vega Graphics Processors
* Refer to www.asus.com for CPU support list.
CPU socketAM4
ChipsetAMD B450
Memory
Memory slot count4 × 288pin (DDR4)
Supported memoryDDR4 4400(OC) / 3533(OC) / 3466(OC) / 3200(OC) / 3000(OC) / 2800(OC) / 2666 / 2400 / 2133 *
* Refer to www.asus.com for the Memory QVL (Qualified Vendors Lists).
Max supported RAM128 GB
Memory channelsDual Channel
ECC supportECC Memory (ECC mode) support varies by CPU.
BufferingUn-buffered
Storage
SATA ports4 x SATA 6Gb/s
SATA and RAID support0/1/10
Graphics
Onboard video chipSupported only by CPU with integrated graphic
Audio & video
Audio chipRealtek ALC S1200A Surround Sound High Definition Audio CODEC
Sound channels7.1 Channels
Connectivity
Ethernet controllerRealtek RTL8125B
Maximum network speed2.5 Gbit/s
Ports & slots
PCIe 3.0 x16 slots1 x PCI Express 3.0 x16*
* Actual support may vary by CPU.
PCIe x16 slotsNone
PCIe x1 slots1 x PCI Express 2.0 x1
Rear panel ports1 x PS/2 keyboard/mouse combo port(s)
1 x DisplayPort
1 x HDMI
1 x LAN (2.5G) port(s)
2 x USB 3.2 Gen 2 (teal blue) (1 x Type-A+1 x USB Type-C)
4 x USB 3.2 Gen 1 (blue) Type-A
2 x USB 2.0
1 x Optical S/PDIF out
5 x Audio jack(s)
1 x BIOS FlashBack Button(s)
HDMI ports1 x HDMI
USB 3.0 ports3 x USB 3.0
Onboard USB headers1 x USB 3.2 Gen 1 (up to 5 Gbit/s) connector(s) support(s) additional 2 USB 3.2 Gen 1 port(s)
2 x USB 2.0 connector(s) support(s) additional 4 USB 2.0 port(s)
Power
Power connectors1 × 24-pin EATX Power connector(s)
1 × 8-pin EATX 12 V Power connectors
Size & build
Form factorMicro ATX
Width and length9.6 in × 9.6 in
Compatibility
Windows 11 supportSupported
More details
PCI express 2.0 x161 x PCI Express 2.0 x16 *
* PCIEX16_2 shares bandwidth with M.2_2. When PCIEX16_2 runs, M.2_2 will be disabled.
LightingRGB

Questions about this item

What is included with the ASUS TUF GAMING B450M-PRO S motherboard and what must be purchased separately?

The motherboard includes the board itself, I/O shield, SATA cables, M.2 screws and driver disc. You must buy a compatible AM4 processor, DDR4 memory modules, storage drives, graphics card if the CPU lacks integrated graphics, power supply, case and CPU cooler separately.

Which DDR4 memory speed should I choose for this board — 3200 MHz or a higher overclocked rating like 4400 MHz?

The board runs DDR4 at 2666 MHz natively. Speeds from 2800 MHz up to 4400 MHz are overclock profiles that require XMP/DOCP support on the memory kit and a capable Ryzen CPU memory controller; 3200 MHz is a common sweet spot for stability and performance.

What does the 2.5 Gb LAN figure mean for actual network throughput on this motherboard?

The 2.5 Gb LAN controller provides up to 2.5 gigabits per second wired bandwidth, roughly 2.5 times standard gigabit Ethernet. Real-world throughput depends on your router, switch, cabling (Cat 5e or better) and internet plan, but local file transfers can approach 280 MB/s.

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