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ATX motherboard with silver heatsinks and a boxed Ryzen 9 9900X3D CPU

ASUS

ASUS ROG STRIX X870-A GAMING WIFI S AMD motherboard & Ryzen 9 9900X3D CPU Combo

SKU CH-FRMX-N9S3B

AM5 motherboard and 12-core Ryzen 9 9900X3D with 128 MB L3 cache, 16+2+2 90 A power stages, DDR5, WiFi 7, two PCIe 5.0 and two PCIe 4.0 M.2 slots, and Radeon graphics

  • CPU Socket TypeAM5
  • ChipsetAMD X870

model ROG STRIX X870-A GAMING WIFI S

+CPU +R9 9900X3D

  • AI-ready platform for demanding workloads
  • 16+2+2 power stages rated at 90A for stable multi-core performance
  • Four M.2 slots with two PCIe 5.0 and two PCIe 4.0 interfaces
  • ASUS AI Overclocking, AI Cooling II and AEMP simplify tuning
  • Ryzen 9 9900X3D delivers 128MB L3 cache for high-speed gaming

Combo Contents

This bundle pairs an ASUS ROG STRIX X870-A GAMING WIFI S motherboard with an AMD Ryzen 9 9900X3D processor. The board uses the AMD X870 chipset and AM5 socket, supporting Ryzen 7000, 8000 and 9000 series CPUs. The included 12-core chip runs at a 120W TDP with 128MB L3 cache and integrated Radeon graphics. It targets builders who want a matched platform for gaming and AI workloads.

Who Should Choose This

Enthusiasts seeking AI-ready connectivity and strong multi-core performance will benefit from the 16+2+2 power stage design rated for 90A per stage. The board provides two PCIe 5.0 M.2 slots and two PCIe 4.0 M.2 slots, all with heatsinks, plus WiFi 7 and USB4. Users needing a smaller form factor or a lower-power CPU should look at other AM5 options.

Deciding Specification

The CPU delivers 12 cores with 128MB of L3 cache and a 120W power envelope. This combination of core count and large cache is the key factor for workloads that scale with thread count and data locality, such as compilation, rendering and advanced AI inference.

Highlights

  • AI-ready platform for demanding workloads
  • 16+2+2 power stages rated at 90A for stable multi-core performance
  • Four M.2 slots with two PCIe 5.0 and two PCIe 4.0 interfaces
  • ASUS AI Overclocking, AI Cooling II and AEMP simplify tuning
  • Ryzen 9 9900X3D delivers 128MB L3 cache for high-speed gaming

Specifications

BrandASUS
ModelROG STRIX X870-A GAMING WIFI S+R9 9900X3D
CPU Socket TypeAM5
ChipsetAMD X870

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

How do I verify the 16+2+2 power stages are delivering 90A per stage to the Ryzen 9 9900X3D after setup?

The AI Overclocking and AI Cooling II utilities in the UEFI or Armoury Crate report real-time per-stage current draw and temperatures so you can confirm the 90A rating is being met under load.

Which cooling parts for the four M.2 slots come in the box versus what must be bought separately?

The board ships with substantial heatsinks pre-installed on both PCIe 5.0 and both PCIe 4.0 M.2 slots; no additional M.2 cooling is required unless you add a fifth drive.

Should I choose this combo or a different capacity for an Advanced AI PC build?

This bundle pairs the X870 chipset with the 12-core Ryzen 9 9900X3D, 128MB L3 cache and 120W TDP — the highest-spec CPU listed for AM5 — making it the top choice for AI workloads.

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