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ATX motherboard with large VRM heatsinks and CPU in AM5 socket

ASUS

ASUS ROG STRIX B850-A GAMING WIFI S AMD motherboard & Ryzen 9 9950X3D CPU combo

SKU CH-Y4CV-9YN5R

Pairs an AM5 B850 board with 16+2 70 A power stages, PCIe 5.0 slot, dual M.2, WiFi 6E, 2.5 G LAN and USB 3.2 Gen 2x2 with a 170 W 128 MB L3 Zen 5 CPU featuring Radeon graphics

  • CPU Socket TypeAM5
  • ChipsetAMD B850

Motherboard ROG STRIX B850-A GAMING WIFI S

Struck-through versions exist but are not stocked here.

CPU + Ryzen 9 9950X3D

  • Stable overclocking headroom from 16+2 power stages rated at 70A
  • PCIe 5.0 x16 slot and dual M.2 slots for high-speed storage and graphics
  • VRM heatsinks with stacked fins plus M.2 heatshields keep temperatures low under load
  • WiFi 6E and 2.5G LAN with rear USB 3.2 Gen 2x2 Type-C at 20Gbps
  • 16-core Zen 5 CPU with 128MB L3 cache and integrated Radeon graphics

AM5 platform with 16+2 power stages

This combo pairs an ASUS ROG STRIX B850-A GAMING WIFI S motherboard with an AMD Ryzen 9 9950X3D processor. The board uses the AMD B850 chipset and an AM5 socket supporting Ryzen 7000, 8000 and 9000 series CPUs. Sixteen plus two 70A power stages with alloy chokes and durable capacitors deliver stable current for overclocking. Dual M.2 slots provide one PCIe 5.0 x4 and one PCIe 4.0 x4 connection alongside a PCIe 5.0 x16 SafeSlot for graphics.

Suited to high-core-count builds with DDR5 memory

The included Ryzen 9 9950X3D is a 170W Zen 5 CPU with 128MB L3 cache, 16MB L2 cache and integrated AMD Radeon graphics. It targets creators and enthusiasts running heavily threaded workloads or high-refresh-rate gaming. The board provides WiFi 6E, 2.5G LAN, rear USB 3.2 Gen 2x2 Type-C at 20Gbps, front USB 3.2 Gen 1 Type-C header and USB4 support via header. Builders needing more than two M.2 slots or a different chipset feature set should consider other platforms.

128MB L3 cache on the processor

The Ryzen 9 9950X3D carries 128MB of L3 cache, a figure that directly influences gaming latency and throughput in cache-sensitive titles. This capacity distinguishes the X3D line from standard Zen 5 parts and is the primary specification to verify when matching the CPU to workload expectations. The motherboard complements it with DDR5 optimisation, VRM heatsinks with stacked fins, M.2 heatshields and hybrid fan headers including AIO pump support.

Highlights

  • Stable overclocking headroom from 16+2 power stages rated at 70A
  • PCIe 5.0 x16 slot and dual M.2 slots for high-speed storage and graphics
  • VRM heatsinks with stacked fins plus M.2 heatshields keep temperatures low under load
  • WiFi 6E and 2.5G LAN with rear USB 3.2 Gen 2x2 Type-C at 20Gbps
  • 16-core Zen 5 CPU with 128MB L3 cache and integrated Radeon graphics

Specifications

BrandASUS
ModelROG STRIX B850-A GAMING WIFI S Motherboard + Ryzen 9 9950X3D
CPU Socket TypeAM5
ChipsetAMD B850

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

What DDR5 memory do I need to populate the board's memory slots?

The board accepts DDR5 modules; install them in the DIMM slots and the system will train at the rated speed.

Will my existing PCIe 4.0 graphics card run in the PCIe 5.0 x16 SafeSlot?

Yes, the PCIe 5.0 x16 SafeSlot is backward compatible and will operate the card at PCIe 4.0 speeds.

How can I confirm the Ryzen 9 9950X3D is boosting correctly after assembly?

Enter the BIOS and verify the CPU reports 128MB L3 cache, 16MB L2 cache and Radeon graphics active.

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