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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 Socket TypeAM5
  • ChipsetAMD B850
  • Number of Memory Slots4x288pin (DDR5)
  • Maximum Memory Supported192GB
  • Channel SupportedDual Channel
  • ECC SupportedYes

Motherboard ROG STRIX B850-F GAMING WIFI

Struck-through versions exist but are not stocked here.

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.

Highlights

  • 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

Specifications

BrandASUS
ModelROG STRIX B850-F GAMING WIFI+R9 9900X3D
CPU Socket TypeAM5
ChipsetAMD B850
Number of Memory Slots4x288pin (DDR5)
Maximum Memory Supported192GB
Channel SupportedDual Channel
ECC SupportedYes
Buffer SupportedUn-buffered
Memory FeatureDual channel memory architecture
Supports AMD Extended Profiles for Overclocking (EXPO)
ASUS Enhanced Memory Profile (AEMP)
PCI Express 5.0 x16AMD Ryzen 9000 & 7000 Series Desktop Processors
- 1 x PCIe 5.0 x16 slot with Q-Release Slim
AMD Ryzen 8000 Series Desktop Processors
- 1 x PCIe 5.0 x16 slot with Q-Rlease Slim (supports PCIe 4.0 x8 or x4 mode)*
PCI Express 4.0 x161 x PCIe 4.0 x16 slot (supports x4 mode)**
* Specifications vary by CPU types.
** PCIEX16(G4) slot (supports x4 mode) from AMD B850 Chipset shares bandwidth with M.2_3
Serial ATA (SATA)2 x SATA 6Gb/s
M.2AMD Ryzen 7000 & 9000 Series Desktop Processors
M.2_1 (Key M), type 2242/2260/2280 (supports PCIe 5.0x4 mode)
M.2_2 (Key M), type 2280/22110 (supports PCIe 5.0 x4 mode)
AMD Ryzen 8000 Series Desktop Processors
M.2_1 (Key M), type 2242/2260/2280 (supports PCIe 4.0x4 mode)
M.2_2 (Key M), type 2280/22110 (supports PCIe 4.0 x4/x2 mode)
AMD B850 Chipset
M.2_3 (Key M), type 2280 (supports PCIe 4.0 x4)**
M.2_4 (Key M), type 2280 (supports PCIe 4.0 x4)
** M.2_3 slot shares bandwidth with PCIEX16(G4). When PCIEX16(G4) slot is operating, M.2_3 will be disabled.
SATA RAID0/1/5/10
Audio ChipsetRealtek ALC4080
Audio 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
Max LAN Speed2.5Gbps
Wireless LANWi-Fi 802.11 be
BluetoothBluetooth 5.4
Back I/O Ports1 x USB 20Gbps port (1 x USB Type-C)
3 x USB 10Gbps ports (2 x Type-A + 1 x USB Type-C)
4 x USB 5Gbps ports (4 x Type-A)
4 x USB 2.0 ports (4 x Type-A)
1 x DisplayPort
1 x HDMI port
1 x Wi-Fi module
1 x Intel 2.5Gb Ethernet port
2 x Audio jacks
1 x Optical S/PDIF out port
1 x BIOS FlashBack button
1 x Clear CMOS button
Onboard USB1 x USB 10Gbps connector (supports USB Type-C)
1 x USB 5Gbps header supports 2 additional USB 5Gbps ports
2 x USB 2.0 headers support 4 additional USB 2.0 ports
Other ConnectorsFan and Cooling Related
1 x 4-pin CPU Fan header
1 x 4-pin CPU OPT Fan header
1 x 4-pin AIO Pump header
4 x 4-pin Chassis Fan headers
Miscellaneous
3 x Addressable Gen 2 headers
1 x CPU Over voltage jumper
1 x Front Panel Audio header (F_AUDIO)
1 x Power button
1 x 10-1 pin Front System Panel header
1 x Thermal Sensor header
1 x Thunderbolt (USB4) header
Form FactorATX
Dimensions (W x L)12.0" x 9.6"
Power Pin1 x 24-pin Main Power connector
2 x 8-pin +12V CPU Power connector
BIOS Feature256 Mb Flash ROM, UEFI AMI BIOS
SoftwareROG Exclusive Software
- ROG CPU-Z
- Dolby Atmos
ASUS Exclusive Software
Armoury Crate
- AIDA64 Extreme (60 days free trial)
- Aura Creator
- Aura Sync
- Fan Xpert 4
- GameFirst
- HWiNFO
- Power Saving
ASUS DriverHub
ASUS GlideX
TurboV Core
Adobe Creative Cloud (Free Trial)
Norton 360 for Gamers (60 Days Free Trial)
WinRAR (40 Days Free Trial)
UEFI BIOS
ASUS EZ DIY
- ASUS CrashFree BIOS 3
- ASUS EZ Flash 3
- ASUS UEFI BIOS EZ Mode
- ASUS MyHotkey
Windows 11Supported
FeaturesExtreme Engine Digi+
- 5K Black metallic capacitors
ASUS Q-Design
- M.2 Q-Latch
- M.2 Q-Release
- M.2 Q-Slide
- PCIe Slot Q-Release Slim (with PCIe SafeSlot)
- Q-Antenna
- Q-Dashboard
- Q-DIMM
- Q-LED (CPU [red], DRAM [yellow], VGA [white], Boot Device [yellow green])
- Q-Slot
ASUS Thermal Solution
- M.2 heatsink backplate
- M.2 heatsink
ASUS EZ DIY
- BIOS FlashBack button
- BIOS FlashBack LED
- Clear CMOS button
- ProCool
- Pre-mounted I/O shield
- SafeSlot
- SafeDIMM
Aura Sync
- Addressable Gen 2 headers
Package Contents1 x AMD Ryzen 9 9900X3D CPU
Cables
2 x SATA 6Gb/s cables
Miscellaneous
1 x ASUS WiFi Q-Antenna
1 x Cable ties package
1 x M.2 Q-Latch package
1 x M.2 Q-Slide package
1 x ROG key chain
1 x ROG Strix stickers
4 x M.2 rubbers
Documentation
1 x Quick start guide

Other versions of this model

5 more in the same range

Same family, different memory, cooler or clock — compare before you commit.

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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