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ATX motherboard with large VRM heatsinks and pre-installed I/O shield, paired with Ryzen 9 9900X CPU

ASUS

ASUS PRIME X870-P & Ryzen 9 9900X AMD motherboard CPU combo

SKU CH-V331-S4CSD

A motherboard and CPU combo with an AM5 socket board offering four M.2 slots, 2.5 Gb Ethernet, USB 40 Gbps, 12 CPU cores, 24 threads and 5.6 GHz max boost

  • CPU socketAM5

Motherboard PRIME X870-P

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CPU + R9 9900X

  • Ready-to-build combo with matched ASUS PRIME X870-P board and Ryzen 9 9900X CPU
  • 12 cores and 24 threads on Zen 5 architecture deliver high multi-thread throughput
  • 6 GHz max boost clock with unlocked multiplier enables overclocking headroom
  • 14+2+1 80 A DrMOS power stages and large VRM heatsink sustain heavy loads
  • Four M.2 slots plus PCIe 5.0 and USB 40 Gbps provide fast storage and I/O expansion

Combo for AM5 builds

The ASUS PRIME X870-P motherboard paired with the AMD Ryzen 9 9900X processor targets enthusiasts building a high-performance AM5 system. The CPU delivers 12 cores and 24 threads based on the Zen 5 architecture with a 5.6 GHz max boost clock. The board provides an ATX form factor with four M.2 slots and DDR5 memory support. This combination suits content creators and power users who need strong multi-threaded throughput.

Sustained load behaviour

The motherboard uses a 14+2+1 phase DrMOS power design rated at 80A per phase alongside a large VRM heatsink to handle prolonged current delivery. Multiple high-efficiency heatsinks and hybrid fan headers work with ASUS Fan Xpert 4 software to manage thermals during extended workloads. The 64 MB L3 cache and 12 MB L2 cache on the processor help maintain data locality under continuous multi-core pressure. PCIe 5.0 support on select slots preserves bandwidth for modern GPUs and storage during long sessions.

Installation experience

A pre-installed I/O backplate simplifies mounting the board into the chassis. The BIOS FlashBack button allows firmware updates without a CPU or memory installed, reducing a common setup hurdle. SafeSlot reinforced PCIe slots add mechanical security for heavy graphics cards. Note that the Ryzen 9 9900X ships without a cooler, so a compatible AM5 thermal solution must be sourced separately before first boot.

How it compares

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

Price $799.99
Pricier than about 78% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameASUS
Model namePRIME X870-P+R9 9900X
Processor
CPU socketAM5

Other versions of this model

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Questions about this item

How loud and hot does the 14 plus 2 plus 1 DrMOS power stage with large VRM cooler run during all-day loads?

The board uses 14 plus 2 plus 1 eighty-amp DrMOS stages and a large VRM heatsink managed by ASUS Fan Xpert 4, keeping thermals and fan noise low under sustained workloads

What memory and cooler must I already own to use the Ryzen 9 9900X in this combo?

You need DDR5 modules and a separate AM5-compatible CPU cooler, as the 9900X ships without one and the platform only supports DDR5

Will my existing SATA drives and DDR5 memory work with the X870 chipset and Ryzen 9000 series?

The motherboard provides SATA 6Gbps ports for current drives and DDR5 slots rated for 5600 MT/s, so both storage and memory carry over directly

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