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ATX motherboard with silver heatsinks and installed Ryzen 9 9900X CPU

ASUS

ASUS ROG STRIX B850-A GAMING WIFI S Motherboard & AMD Ryzen 9 9900X CPU Combo

SKU CH-19AC-4XZ1K

Pairs an AM5 board with 16+2 70A power stages, PCIe 5.0 x16 and dual M.2 slots, WiFi 6E and 2.5G LAN with a 12-core 24-thread Ryzen 9 9900X reaching 5.6 GHz boost

  • 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 9900X

  • Stable overclocking headroom from 16+2 power stages rated at 70A each
  • Next-gen storage speed via one PCIe 5.0 x16 slot and dual M.2 slots
  • Sustained performance under load through VRM heatsinks with stacked fins and M.2 heatshields
  • Fast wired and wireless networking with 2.5G LAN plus WiFi 6E
  • 12 cores and 24 threads on Zen 5 architecture reaching 5.6 GHz max boost

AM5 Platform Ready for Ryzen 9000 Series

This combo pairs an ASUS ROG STRIX B850-A GAMING WIFI S motherboard with a 12-core AMD Ryzen 9 9900X processor. The board supports Ryzen 7000, 8000 and 9000 series CPUs on the AM5 socket. The CPU delivers 24 threads, a 5.6 GHz max boost and 64 MB L3 cache for demanding workloads and high-frame-rate gaming.

Straightforward Install with Clear Steps

The motherboard uses a 16+2 power stage design rated at 70A with alloy chokes and durable capacitors. DDR5 memory slots accept 5600 MT/s modules. One PCIe 5.0 x16 SafeSlot and two M.2 slots (one PCIe 5.0 x4, one PCIe 4.0 x4) are keyed to prevent misalignment. Rear I/O includes WiFi 6E, 2.5G LAN, USB 3.2 Gen 2x2 Type-C at 20 Gbps and a USB4 header. Common issues: forgetting to update BIOS for the 9000 series CPU, seating the CPU without the cooler installed, and leaving the M.2 heatshield screws loose.

Sustained Load Stability Through Robust Cooling

VRM heatsinks with stacked fins and M.2 heatshields with thermal pads dissipate heat during extended sessions. Multiple hybrid fan headers including AIO pump support allow flexible cooling curves. The 70A power stages maintain stable voltage under continuous all-core loads. DDR5-5600 operation remains consistent without throttling. PCIe 5.0 graphics and storage bandwidth hold steady during prolonged rendering or compilation tasks.

Highlights

  • Stable overclocking headroom from 16+2 power stages rated at 70A each
  • Next-gen storage speed via one PCIe 5.0 x16 slot and dual M.2 slots
  • Sustained performance under load through VRM heatsinks with stacked fins and M.2 heatshields
  • Fast wired and wireless networking with 2.5G LAN plus WiFi 6E
  • 12 cores and 24 threads on Zen 5 architecture reaching 5.6 GHz max boost

Specifications

BrandASUS
ModelROG STRIX B850-A GAMING WIFI S Motherboard + Ryzen 9 9900X
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

How do I verify the 16+2 power stages are delivering clean voltage to the Ryzen 9 9900X after assembly?

Enter the UEFI and monitor the Vcore and VRM temperature readings under load; stable voltages and temperatures within specification confirm the 70A power stages are operating correctly.

What components are included in the combo box and which essential parts must be purchased separately?

The box contains the ROG STRIX B850-A GAMING WIFI S motherboard and the Ryzen 9 9900X processor; you must buy DDR5 memory, a CPU cooler, storage drives, a power supply, a case and a graphics card separately.

Which DDR5 speed should I select to match the Ryzen 9 9900X specifications?

Choose DDR5-5600 modules, as the processor officially supports that data rate and the motherboard is optimised for it.

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