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ATX motherboard with large VRM heatsinks and CPU in AM5 socket

ASUS

ASUS PRIME X870-P WIFI + Ryzen 9 9900X3D CPU AMD motherboard combo

SKU CH-EJTE-NEH3P

Socket AM5 motherboard and 12-core Ryzen CPU with 128MB L3 cache, DDR5 to 192GB, PCIe 5.0 x16 and M.2, Wi-Fi 7, 2.5Gb Ethernet, USB4 40Gbps

  • ChipsetAMD X870
  • Form factorATX
  • Memory slot count4 × 288pin (DDR5)
  • Supported memoryDDR5 4400
  • Max supported RAM192 GB
  • Memory channelsDual Channel

Model PRIME X870-P WIFI

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CPU + Ryzen 9 9900X3D

  • Stable power for heavy workloads with 14+2+1 80A DrMOS stages
  • Faster wireless networking via Wi-Fi 7 and Bluetooth 5.4
  • High-speed storage ready with PCIe 5.0 M.2 and x16 slots
  • AI-ready compute from Ryzen 9 9900X3D with 128MB L3 cache
  • Easy build experience using Q-Release, Q-Latch and pre-mounted I/O shield

Ready for AI workloads

This motherboard and CPU combo pairs the ASUS PRIME X870-P WIFI with the AMD Ryzen 9 9900X3D processor. The board uses the AMD X870 chipset and AM5 socket to support Ryzen 9000, 8000 and 7000 series chips. It targets builders who need high multi-thread throughput for AI inference, content creation and heavy multitasking. Four DDR5 slots accept up to 192 GB of memory.

Sustained power delivery

The 14+2+1 80A DrMOS power stages sit on an 8-layer PCB with ProCool connectors, alloy chokes and durable capacitors. A large VRM heatsink, dual M.2 heatsinks and a PCH heatsink work with Fan Xpert 4 and AI Cooling II to keep temperatures stable during long compute sessions. The 120 W Zen 5 CPU with 128 MB L3 cache maintains high clocks without thermal throttling.

DIY-friendly assembly

A pre-mounted I/O shield, Q-Antenna, PCIe Slot Q-Release and M.2 Q-Latch reduce installation steps. BIOS FlashBack updates firmware without a CPU installed. Q-Dashboard and Q-LED Core give clear post-code feedback if a component is not seated correctly. The flexible M.2 heatsink fits 2280 drives without forcing the board layout.

How it compares

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

Price $1,099.99
Pricier than about 90% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameASUS
Model namePRIME X870-P WIFI+R9 9900 × 3D
Processor
ChipsetAMD X870
Memory
Memory slot count4 × 288pin (DDR5)
Supported memoryDDR5 4400
Max supported RAM192 GB
Memory channelsDual Channel
ECC supportYes
BufferingUn-buffered
Storage
SATA ports2 x SATA 6Gb/s
SATA and RAID support* AMD RAIDXpert2 Technology supports both PCIe RAID 0/1/5/10 and SATA RAID 0/1. RAID 5 Function is only supportted by AMD Ryzen 9000 series CPU.
Audio & video
Audio chipRealtek 7.1 Surround Sound High Definition Audio CODEC*
- Supports: Jack-detection, Multi-streaming, Front Panel Jack-retasking
- Supports up to 24-Bit/192 kHz playback
Audio Features
- Audio Shielding
- Premium audio capacitors
- Dedicated audio PCB layers
* A chassis with an HD audio module in the front panel is required to support 7.1 Surround Sound audio output.
Sound channels7.1 Channels
Connectivity
Maximum network speed2.5 Gbit/s
Wi-Fi standardWi-Fi 802.11 be
Bluetooth support5.4
Ports & slots
PCIe 5.0 x16 slotsAMD Ryzen 9000 & 7000 Series Desktop Processors
1 x PCIe 5.0 x16 slot (supports x16 mode)
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 connectors
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

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Questions about this item

Will the 14+2+1 80A DrMOS power stages handle the 120W Ryzen 9 9900X3D without extra cooling?

The board uses 14+2+1 80A DrMOS stages on an 8-layer PCB with a large VRM heatsink and AI Cooling II fan control, which together provide stable delivery for the 120W CPU under sustained load.

Can I run four DDR5 modules at 8000 MT/s with this CPU?

The motherboard supports up to 8000+ MT/s via EXPO on Ryzen 9000 series, but stability at that speed with four populated slots depends on the memory kit and CPU silicon quality; testing is recommended.

Does the PCIe 5.0 x16 slot share bandwidth with any M.2 slot?

The primary PCIe 5.0 x16 slot runs at x16 from the CPU and does not share bandwidth; the chipset PCIe 4.0 x16 slot shares bandwidth with M.2_2, not the top graphics slot.

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