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Black ATX motherboard with large silver heatsinks and integrated I/O cover, paired with a square CPU in anti-static tray

ASUS

ASUS ROG STRIX B850-F GAMING WIFI + Ryzen 9 9900X3D AMD motherboard & CPU Combo

SKU CH-6SBN-FAT9D

AM5 motherboard and 12-core Ryzen 9 9900X3D combo with 128 MB L3 cache, DDR5 to 192 GB, two PCIe 5.0 M.2 slots, WiFi 7, 2.5 Gbps LAN and 20 Gbps USB-C

  • CPU socketAM5
  • ChipsetAMD B850
  • Form factorATX
  • Memory slot count4 × 288pin (DDR5)
  • Max supported RAM192 GB
  • Memory channelsDual Channel

Motherboard ROG STRIX B850-F GAMING WIFI

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CPU + Ryzen 9 9900X3D

  • Robust power delivery for heavy multi-core workloads with 16+2+2 stages rated at 80A
  • Two PCIe 5.0 M.2 slots and two PCIe 4.0 M.2 slots all with dedicated heatsinks
  • WiFi 7 and 2.5Gbps Ethernet plus Bluetooth 5.4 for high-speed wireless and wired networking
  • 192GB DDR5 capacity across four slots with EXPO and AEMP for simplified memory tuning
  • 128MB L3 cache on the Ryzen 9 9900X3D boosts gaming and compute throughput

Combo for AI and gaming workloads

This bundle pairs an ASUS ROG STRIX B850-F GAMING WIFI motherboard with an AMD Ryzen 9 9900X3D processor. The AM5 platform supports Ryzen 9000, 8000 and 7000 series CPUs. It targets builders who want a single validated kit for advanced AI PC tasks and high-end gaming.

AI software tools and high-speed connectivity

ASUS AI Advisor, AI Networking II and AEMP simplify memory tuning and network optimisation. The board adds WiFi 7, Bluetooth 5.4 and Intel 2.5 Gb Ethernet. Front-panel USB reaches 20 Gbps via Type-C, while four rear ports run at 10 Gbps.

128 MB L3 cache on the CPU

The Ryzen 9 9900X3D delivers 128 MB of L3 cache plus 12 MB L2 on a 120 W TSMC 4 nm Zen 5 die with integrated Radeon graphics. That cache capacity is the decisive factor for latency-sensitive gaming and AI inference workloads.

How it compares

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

Price $986.99
Pricier than about 88% 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 nameROG STRIX B850-F GAMING WIFI+R9 9900 × 3D
Processor
CPU socketAM5
ChipsetAMD B850
Memory
Memory slot count4 × 288pin (DDR5)
Max supported RAM192 GB
Memory channelsDual Channel
ECC supportYes
BufferingUn-buffered
Storage
SATA ports2 x SATA 6Gb/s
SATA and RAID support0/1/5/10
Audio & video
Audio chipRealtek ALC4080
Sound channelsROG SupremeFX 7.1 Surround Sound High Definition Audio CODEC ALC4080*
- Impedance sense for front and rear headphone outputs
- Supports: Jack-detection, Multi-streaming, Front Panel MIC Jack-retasking
- High quality 120 dB SNR stereo playback output and 110 dB SNR recording input
- Supports up to 32-Bit/384 kHz playback on front panel
Audio Features
- SupremeFX Shielding Technology
- Savitech SV3H712 AMP
- Rear optical S/PDIF out port
- Premium audio capacitors
- Audio cover
Connectivity
Maximum network speed2.5 Gbit/s
Wi-Fi standardWi-Fi 802.11 be
Bluetooth support5.4
Ports & slots
Onboard USB headers1 x USB 10 Gbit/s connector (supports USB Type-C)
1 x USB 5 Gbit/s header supports 2 additional USB 5 Gbit/s ports
2 x USB 2.0 headers support 4 additional USB 2.0 ports
Power
Power connectors1 × 24-pin Main Power connector
2 × 8-pin +12 V CPU Power connector
Size & build
Form factorATX
Width and length12.0 in × 9.6 in
Compatibility
Windows 11 supportSupported
More details
BIOS256 Mb Flash ROM, UEFI AMI BIOS

Other versions of this model

5 more in the same range

Questions about this item

Will the 16+2+2 power stages rated at 80A each need any maintenance or replacement over time?

The 16+2+2 power solution uses high-quality alloy chokes and durable capacitors designed for long-term operation with the 120W Ryzen 9 9900X3D; no user-serviceable maintenance is required on the power stages themselves.

What limit appears first when the 120W CPU runs sustained workloads on this board?

The 16+2+2 power stages rated for 80A per stage and the massive heatsinks with integrated I/O cover are engineered to handle the 120W TDP continuously, so thermal and power delivery limits are matched to the processor.

How much noise and heat does the combo produce when running all day with the 120W CPU?

Optimized thermal design with massive heatsinks, high-conductivity thermal pads and substantial M.2 cooling manages the 120W processor heat; fan noise depends on your chassis airflow and fan curve settings.

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