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ATX motherboard with AM5 socket CPU installed, dark PCB with silver heatsinks

ASUS

ASUS PRIME B850-PLUS & Ryzen 9 9900X AMD motherboard combo

SKU CH-HMDX-KMMS9

An AM5 motherboard and 12-core, 24-thread Ryzen 9 9900X CPU combo with 12+2 phase power, DDR5 optimisation, one PCIe 5.0 and two PCIe 4.0 M.2 slots, plus 2.5 Gb Ethernet

  • CPU Socket TypeAM5

Motherboard PRIME B850-PLUS

CPU + R9 9900X

  • 12-core 24-thread Ryzen 9 9900X delivers high multi-tasking throughput
  • 12+2 phase Digi+ VRM supplies stable power for Ryzen 9000/8000/7000 CPUs
  • AEMP boosts DDR5-5600 speeds and tightens timings on non-EXPO kits
  • One PCIe 5.0 x4 M.2 slot at 128 Gbps plus two PCIe 4.0 x4 slots for fast storage
  • 5Gb Ethernet with LANGuard gives faster, more reliable wired networking

Motherboard & CPU Combo

This bundle pairs the ASUS PRIME B850-PLUS motherboard with the AMD Ryzen 9 9900X processor for Socket AM5. The combination targets enthusiasts building a high-performance desktop around the Zen 5 architecture and DDR5 memory.

DIY-Friendly Installation

A pre-mounted I/O shield simplifies motherboard placement in the chassis. Fan Xpert 2+ provides granular cooling control, while Aura Sync addressable Gen 2 headers let you coordinate RGB lighting without extra adapters.

Capacity & Headroom

The 12-core, 24-thread CPU reaches a 5.6 GHz max boost with 64 MB L3 cache and supports DDR5-5600. Storage headroom comes from one PCIe 5.0 x4 M.2 slot (up to 128 Gbps) plus two PCIe 4.0 x4 slots, while 2.5 Gb Ethernet handles wired networking.

Points forts

  • 12-core 24-thread Ryzen 9 9900X delivers high multi-tasking throughput
  • 12+2 phase Digi+ VRM supplies stable power for Ryzen 9000/8000/7000 CPUs
  • AEMP boosts DDR5-5600 speeds and tightens timings on non-EXPO kits
  • One PCIe 5.0 x4 M.2 slot at 128 Gbps plus two PCIe 4.0 x4 slots for fast storage
  • 5Gb Ethernet with LANGuard gives faster, more reliable wired networking

Caractéristiques

BrandASUS
ModelPRIME B850-PLUS+R9 9900X
CPU Socket TypeAM5

Autres versions de ce modèle

5 de plus dans cette gamme

Même famille, mémoire, ventirad ou fréquence différents — comparez avant de vous décider.

Questions sur cet article

How do I verify the 12+2 phase VRM is delivering stable power to the Ryzen 9 9900X after build completion?

Enter the UEFI and monitor the CPU Vcore and VRM temperature readings under load; steady voltages and controlled thermals confirm the Digi+ VRM is operating as designed for the 12-core processor.

The combo lists a pre-mounted I/O shield — which other components must I purchase separately to finish the system?

You still need DDR5 memory modules, a CPU cooler compatible with AM5, storage drives for the three M.2 slots, a graphics card, a power supply, and a chassis.

The board offers one PCIe 5.0 x4 M.2 slot and two PCIe 4.0 x4 slots — which should I use for the primary OS drive?

Install the OS on the PCIe 5.0 x4 M.2 slot to utilise the full 128 Gbps bandwidth; reserve the two PCIe 4.0 x4 slots for secondary storage or games.

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