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Dark ATX motherboard with CPU installed, large heatsinks and rear I/O shield

ASUS

ASUS ROG Crosshair X870E Dark Hero AMD motherboard & Ryzen 9 9900X CPU Combo

SKU CH-HMMX-W4PXV

AM5 motherboard and Ryzen 9 9900X combo with DDR5 support to 9600 MT/s, five M.2 slots, dual USB4, 10 GbE, 5 GbE, Wi-Fi 802.11 be and Bluetooth 5.4

  • CPU socketAM5
  • ChipsetAMD X870E
  • Form factorATX
  • Memory slot count4 × 288pin (DDR5)
  • Supported memorySupports up to 8600+MT/s(OC)/8200+MT/s(OC) with Ryzen 9000 S
  • Max supported RAM256 GB

Model ROG CROSSHAIR X870E DARK HERO

CPU +Ryzen 9 9900X

  • AM5 socket supports Ryzen 9000, 8000 and 7000 series processors
  • Four DDR5 slots reach 8600 MT/s with Ryzen 9000 CPUs
  • 20 plus 2 plus 2 power stages rated at 110 A each deliver stable voltage
  • 3D vapour-chamber M.2 heatsink cools one PCIe 5.0 slot
  • Dual USB4 Type-C ports provide 40 Gbps bandwidth

AMD AM5 Platform Ready

This bundle pairs the ROG Crosshair X870E Dark Hero motherboard with a Ryzen 9 9900X processor, delivering an AM5 platform that supports Ryzen 9000, 8000 and 7000 series CPUs. Four DDR5 slots accept up to 256GB of memory, while five M.2 slots and four SATA ports provide extensive storage expansion for enthusiasts and creators.

Sustained Load Thermal Design

A 3D vapor-chamber heatsink covers the primary PCIe 5.0 M.2 slot, and massive VRM heatsinks integrate with the I/O cover through an L-shaped heatpipe and high-conductivity thermal pads. The 20+2+2 110A power stages with ProCool II connectors maintain stable delivery during prolonged compute or rendering sessions, while AI Cooling II balances fan curves automatically.

Upgrade Path From Older AM5 Builds

Builders moving from a 7000-series CPU gain access to DDR5 speeds up to 9600 MT/s with 9000-series processors, dual USB4 40Gbps ports, 10Gbps and 5Gbps Ethernet, and Wi-Fi 802.11 be. The jump is worthwhile when workloads demand higher memory bandwidth, faster external I/O or the AI Cache Boost and AI Overclocking toolset.

How it compares

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

Price $1,431.99
Pricier than about 92% 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 CROSSHAIR X870E DARK HERO +(R9 9900X)
Processor
CPU socketAM5
ChipsetAMD X870E
Memory
Memory slot count4 × 288pin (DDR5)
Supported memorySupports up to
8600+MT/s(OC)/8200+MT/s(OC) with Ryzen 9000 Series Processors
9600+MT/s(OC)/9200+MT/s(OC) with Ryzen 8000 Series Processors
8000+MT/s(OC)/8000+MT/s(OC) with Ryzen 7000 Series Processors
Max supported RAM256 GB
Memory channelsDual Channel
ECC supportYes
BufferingUn-buffered
Storage
SATA ports4 x SATA 6Gb/s
M.2 slotsAMD Ryzen 9000 & 7000 Series Desktop Processors
M.2_1 slot (Key M), type 2242/2260/2280/22110 (supports PCIe 5.0 x4 mode)
M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 5.0 x4 mode)**
AMD Ryzen 8000 Series Desktop Processors
M.2_1 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4 mode)
M.2_2 slot (Key M), type 2242/2260/2280 (Not supports)
AMD X870E Chipset
M.2_3 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4 mode)
M.2_4 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4 mode)
M.2_5 slot (Key M), type 2230 (supports PCIe 4.0 x2 mode)
*When both PCIEX16_1 a
SATA and RAID supportAMD RAIDXpert2 Technology
Ryzen 9000 & 8000 & 7000 Series Processors: RAID 0/1/5/10
Audio & video
Sound channelsROG SupremeFX 7.1 Surround Sound High Definition Audio CODEC ALC4082*
- 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
- ESS ES9219 QUAD DAC
- Gold-plated audio jacks
- Rear optical S/PDIF out port
- Premium audio capacitors
* A chassis with an HD audio module in the front panel is required to support 7.1 Surround Sound au
Connectivity
Maximum network speed10 Gbit/s + 5 Gbit/s
Wi-Fi standardWi-Fi 802.11 be
Bluetooth support5.4
Ports & slots
Onboard USB headers2 x USB 20 Gbit/s connectors (support USB Type-C)
2 x USB 5 Gbit/s headers support 4 additional USB 5 Gbit/s ports
3 x USB 2.0 headers support 6 additional USB 2.0 ports
Power
Power connectors1 × 24-pin Main Power connector
2 × 8-pin +12 V CPU Power connector
1 × 8-pin PCIe Power connector
Size & build
Form factorATX
Width and length12.0 in × 9.6 in
More details
BIOS64 MB (512Mb)
Flash ROM, UEFI AMI BIOS

Other versions of this model

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Questions about this item

Will the included CPU work with the motherboard socket out of the box?

Yes, the Ryzen 9 9900X uses the AM5 socket and is fully supported by the X870E chipset on this board.

What DDR5 memory speeds can I reach with the bundled processor?

With the Ryzen 9000 series CPU you can run DDR5 up to 8600 MT/s overclocked, or 8200 MT/s for a stable overclocked profile.

How many PCIe 5.0 M.2 drives can I install and keep cool?

Two PCIe 5.0 M.2 slots are onboard; the first slot has a dedicated 3D vapour-chamber heatsink, the second uses the board's substantial M.2 cooling array.

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