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ATX motherboard in dark finish with large VRM heatsinks, CPU installed, silver I/O shield, four DDR5 slots, PCIe 5.0 slot

ASUS

ASUS ROG STRIX B850-A GAMING WIFI S AMD motherboard & Ryzen 9 9900X3D CPU Combo

SKU CH-RDPB-DT2AG

AM5 motherboard and 12-core Ryzen 9 9900X3D combo with DDR5, PCIe 5.0 slot, WiFi 6E, 2.5G LAN and 128MB L3 cache

  • CPU Socket TypeAM5
  • ChipsetAMD B850

Motherboard ROG STRIX B850-A GAMING WIFI S

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CPU + Ryzen 9 9900X3D

  • Stable overclocking headroom from 16+2 power stages rated at 70A
  • Next-generation GPU and storage bandwidth via PCIe 5.0 x16 slot and dual M.2 slots
  • Cooler sustained loads through VRM heatsinks with stacked fins and M.2 heatshields with thermal pads
  • Fast wired and wireless networking with WiFi 6E and 2.5G LAN plus LANGuard protection
  • High-speed peripheral connectivity using rear USB 3.2 Gen 2x2 Type-C at 20Gbps and USB4 header support

AM5 Combo for High-End Builds

This bundle pairs the ROG STRIX B850-A GAMING WIFI S motherboard with the AMD Ryzen 9 9900X3D processor. The board uses the AMD B850 chipset and AM5 socket to support Ryzen 7000, 8000 and 9000 series CPUs. It targets enthusiasts who want a ready-to-run platform for gaming and heavy multitasking without selecting parts separately.

16+2 Power Stages and Dual M.2 Slots

The motherboard delivers 16+2 power stages rated at 70A each, using alloy chokes and durable capacitors for stable overclocking. One PCIe 5.0 x16 SafeSlot and two M.2 sockets are provided, one running at PCIe 5.0 x4 and the other at PCIe 4.0 x4. Rear I/O includes WiFi 6E, 2.5G LAN with LANGuard, USB 3.2 Gen 2x2 Type-C at 20Gbps, a front-panel USB 3.2 Gen 1 Type-C header and USB4 support via header. VRM heatsinks with stacked fins and M.2 heatshields with thermal pads handle thermals alongside multiple hybrid fan headers that include AIO pump support.

Drop-In AM5 Installation

The CPU drops into the AM5 socket with no pins to bend, and the cooler mounts using the standard AM5 hole pattern. DDR5 memory installs in the usual vertical slots. Builders should update the BIOS before first boot if the board ships on an older revision, and ensure the 120W processor has adequate cooler clearance. The 12-core, 128MB L3 cache chip includes AMD Radeon graphics for basic display output without a discrete card.

Fordele

  • Stable overclocking headroom from 16+2 power stages rated at 70A
  • Next-generation GPU and storage bandwidth via PCIe 5.0 x16 slot and dual M.2 slots
  • Cooler sustained loads through VRM heatsinks with stacked fins and M.2 heatshields with thermal pads
  • Fast wired and wireless networking with WiFi 6E and 2.5G LAN plus LANGuard protection
  • High-speed peripheral connectivity using rear USB 3.2 Gen 2x2 Type-C at 20Gbps and USB4 header support

Specifikationer

BrandASUS
ModelROG STRIX B850-A GAMING WIFI S +(R9 9900X3D)
CPU Socket TypeAM5
ChipsetAMD B850

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Spørgsmål om denne vare

When will the 120W CPU or the 16+2 power stages need fresh thermal paste or VRM pad replacement?

The Ryzen 9 9900X3D runs at 120W and the board uses 16+2 power stages rated at 70A each with alloy chokes; under normal loads expect to refresh CPU paste every few years and VRM pads only if temperatures rise.

What hits its ceiling first during an all-day compile — the 128MB L3 cache, the DDR5 slots or the 2.5G LAN?

The 128MB L3 cache on the Ryzen 9 9900X3D is fixed; sustained workloads will saturate cache bandwidth before DDR5 memory or the 2.5G LAN become bottlenecks.

How loud and hot does the VRM heatsink with stacked fins get when the 120W processor runs continuously?

Stacked-fin VRM heatsinks, M.2 heatshields with thermal pads and hybrid fan headers including AIO-pump support keep the 120W CPU and 70A power stages cool and quiet under sustained load.

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