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Black ATX motherboard with massive silver heatsinks, integrated I/O shield and a bundled Ryzen 9 9900X3D CPU

ASUS

ASUS ROG CROSSHAIR X870E APEX AMD motherboard & Ryzen 9 9900X3D CPU combo

SKU CH-YFWY-88C88

AM5 motherboard and 12-core Zen 5 CPU with 128 MB L3 cache, DDR5 up to 9600 MT/s, three PCIe 5.0 M.2 slots, Wi-Fi 7 and 5 Gb Ethernet

  • CPU Socket TypeAM5
  • CPU TypeAMD Socket AM5 for AMD Ryzen™ 9000 & 8000 & 7000 Series Desk
  • ChipsetAMD X870E
  • Number of Memory Slots2x288pin (DDR5)
  • Memory Standard2 x DIMM slots, max. 128GB, DDR5 Supports up to 8200+MT/s(OC
  • Maximum Memory Supported128GB

model ROG CROSSHAIR X870E APEX

+CPU +Ryzen 9 9900X3D

  • 12-core CPU with 128 MB L3 cache for heavy workloads
  • 18+2+2 power stages rated 110 A and 80 A for stable overclocking
  • DDR5 up to 9600 MT/s supported with included ROG Memory Fan
  • Three onboard PCIe 5.0 M.2 slots plus two PCIe 4.0 slots on DIMM.2 card
  • Wi-Fi 7 2x2 320 MHz and 5 Gb Ethernet for high-speed networking

Combo for AM5 builders

This bundle pairs the ROG CROSSHAIR X870E APEX motherboard with an AMD Ryzen 9 9900X3D processor. The board uses the AMD X870E chipset and an AM5 socket that supports Ryzen 9000, 8000 and 7000 series CPUs. It targets enthusiasts who want a pre-matched platform for high-frequency DDR5 and AI workloads. The CPU delivers 12 cores with 128 MB L3 cache and integrated AMD Radeon graphics.

Installation notes

The motherboard fits standard ATX mounting points and uses ProCool II power connectors that seat with a firm click. Two DIMM slots simplify memory routing but require care when inserting modules at 8200 MT/s or higher. The ROG DIMM.2 card installs in a PCIe slot and adds two extra M.2 drives; verify clearance against large CPU coolers. Q-Release Slim buttons release graphics cards without tools, reducing the risk of damaged retention tabs.

Compatibility checklist

Confirm your power supply provides at least two 8-pin EPS cables for the 18+2+2 stage VRM. The chassis must accommodate an ATX board with tall heatsinks and an integrated I/O cover. Memory kits should be on the ASUS QVL for 8200+ MT/s operation with Ryzen 9000 series. For Wi-Fi 7 320 MHz channels, ensure your regulator region permits the 6 GHz band and that antenna mounts are accessible at the rear panel.

Highlights

  • 12-core CPU with 128 MB L3 cache for heavy workloads
  • 18+2+2 power stages rated 110 A and 80 A for stable overclocking
  • DDR5 up to 9600 MT/s supported with included ROG Memory Fan
  • Three onboard PCIe 5.0 M.2 slots plus two PCIe 4.0 slots on DIMM.2 card
  • Wi-Fi 7 2x2 320 MHz and 5 Gb Ethernet for high-speed networking

Specifications

BrandASUS
SeriesROG
ModelROG CROSSHAIR X870E APEX +(R9 9900X3D)
Part NumberROG CROSSHAIR X870E APEX +(R9 9900X3D)
CPU Socket TypeAM5
CPU TypeAMD Socket AM5 for AMD Ryzen™ 9000 & 8000 & 7000 Series Desktop Processors*
* Refer to https://www.asus.com/support/download-center/ for CPU support list.
ChipsetAMD X870E
Number of Memory Slots2x288pin (DDR5)
Memory Standard2 x DIMM slots, max. 128GB, DDR5
Supports up to
8200+MT/s(OC) with Ryzen™ 9000 Series Processors,
9600+MT/s(OC) with Ryzen™ 8000 Series Processors
8000+MT/s(OC) with Ryzen™ 7000 Series Processors,
ECC and Non-ECC, Un-buffered DIMM*
Dual channel memory architecture
Supports AMD Extended Profiles for Overclocking (EXPO™)
ASUS Enhanced Memory Profile (AEMP)
* Supported memory types, data rate (speed), and number of DRAM modules vary depending on the CPU and memory configuration, for more information please refer to CPU/Memory Support list under the Support tab of product information sit
Maximum Memory Supported128GB
ECC SupportedNon-ECC
PCI Express 5.0 x16AMD Ryzen™ 9000 & 7000 Series Desktop Processors*
2 x PCIe 5.0 x16 slots with Q-Release Slim (supports x16 or x8/x8** or x8/x4/x4 modes***)
** When you use both PCIEX16_1 and PCIEX16_2, PCIEX16_1 and PCIEX16_2 will run x8.
***When M.2_3 are enabled, PCIEX16_1 will run x8, and PCIEX16_2 will run x4.
**** When M.2_2 and M.2_3 are enabled simultaneously, PCIEX16_2 will be disabled.
PCI Express 4.0 x16AMD Ryzen™ 8700 & 8600 & 8400 Series Desktop Processors*
2 x PCIe 4.0 x16 slots with Q-Release Slim (only supports PCIEx16_1 & total bandwidth for x8, PCIEx16_2 will be disabled)
AMD Ryzen™ 8500 & 8300 Series Desktop Processors*
2 x PCIe 4.0 x16 slots with Q-Release Slim (only supports PCIEx16_1 & total bandwidth for x4, PCIEx16_2 will be disabled)
AMD X870E Chipset
1 x PCIe 4.0 x4 slot
1 x PCIe 3.0 x1 slot
* Please check the PCIe bifurcation table on the support site (https://www.asus.com/support/FAQ/1037507/).
- To ensure compatibility of the device installed, please refer to https
Serial ATA (SATA)4 x SATA 6Gb/s
M.2Supports 5 x M.2 slots and 4 x SATA 6Gb/s ports*
AMD Ryzen™ 9000 & 7000 Series Desktop Processors***
M.2_1 slot (Key M), type 2242/2260/2280 (supports PCIe 5.0 x4 mode)
M.2_2 slot (Key M), type 2242/2260/2280 (supports PCIe 5.0 x4 mode)
M.2_3 slot (Key M), type 2242/2260/2280 (supports PCIe 5.0 x4 mode)
AMD Ryzen™ 8000 Series Desktop Processors
M.2_1 slot (Key M), type 2242/2260/2280 (supports PCIe 4.0 x4 mode)
M.2_2 slot (Key M), type 2242/2260/2280 (Not supports)
M.2_3 slot (Key M), type 2242/2260/2280 (Not supports)
AMD X870E Chipset
DIMM.2_1 slot (Key M), type 2230/2242/2260/2280
SATA RAID0/1/5/10
Audio ChannelsROG SupremeFX 7.1 Surround Sound High Definition Audio CODEC ALC4080*
- Impedance sense for front and rear headphone outputs
- Supports: Jack-detection, Multi-streaming, Front Panel MIC Jack-retasking
- High quality 120 dB SNR stereo playback output and 110 dB SNR recording input
- Supports up to 32-Bit/384 kHz playback on front panel
Audio Features
- SupremeFX Shielding Technology
- Savitech SV3H712 AMP
- Gold-plated audio jacks
- Rear optical S/PDIF out port
- Premium audio capacitors
- Audio cover
* A chassis with an HD audio module in the front panel is required to support 7.1 Su
Second LAN Chipset1 x Realtek 5Gb Ethernet
ASUS LANGuard
Max LAN Speed5Gbps
Wireless LANWi-Fi 7*
2x2 Wi-Fi 7 (802.11be)
Supports 2.4/5/6GHz frequency band**
Supports Wi-Fi 7 320MHz bandwidth, up to 6.5Gbps transfer rate.
Bluetooth® v5.4***
*Wi-Fi features may vary depending on the operating system
For Windows 11, Wi-Fi 7 will require 24H2 or later version for full functions, Windows 11 21H2/22H2/23H2 only support Wi-Fi 6E.
For Windows 10, please note that no driver is available, refer to the Wi-Fi chipset vendor's website for details.
** Wi-Fi 6GHz frequency band and bandwidth regulatory may vary between countries.
*** The Bluetooth® version may vary, please refer to th
BluetoothYes
Back I/O Ports2 x USB4® (40Gbps) ports (2 x USB Type-C®)
6 x USB 10Gbps ports (5 x Type-A + 1 x USB Type-C®)
2 x USB 5Gbps ports (2 x Type-A)
1 x Wi-Fi module
1 x Realtek 5Gb Ethernet port
1 x PS/2 keyboard/mouse combo port
2 x Gold-plated audio jacks
1 x Optical S/PDIF out port
1 x BIOS FlashBack™ button
1 x Clear CMOS button
Other ConnectorsFan and Cooling Related
1 x 4-pin CPU Fan header
1 x 4-pin CPU OPT Fan header
1 x 4-pin AIO Pump header
2 x 4-pin Chassis Fan headers
2 x 4-pin Full Speed Fan headers
1 x W_PUMP+ header
1 x Extra Flow Fan header
Power Related
1 x 24-pin Main Power connector
2 x 8-pin +12V CPU Power connectors
1 x 8-pin PCIe Power connector
Storage Related
3 x M.2 slots (Key M)
4 x SATA 6Gb/s ports
USB
2 x USB 20Gbps connectors (support USB Type-C® )
2 x USB 5Gbps headers support 4 additional USB 5Gbps ports
2 x USB 2.0 headers support 4 additional USB 2.0 ports
Miscellaneous
1 x 80 Light Bar jumper
3
Form FactorATX
Dimensions (W x L)12 inch x 9.6 inch ( 30.5 cm x 24.4 cm )
Windows 11Supported

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Questions about this item

How can I verify the ROG CROSSHAIR X870E APEX is working correctly after installing the Ryzen 9 9900X3D?

The board posts and shows the CPU detected in BIOS. AI Overclocking and AI Cooling II apply optimized settings automatically. The ROG Memory Fan spins when DDR5 modules exceed thermal thresholds. Check that all 18+2+2 power stages report normal voltages and the 5 Gb Ethernet link lights are active.

What ships in the combo box and what must I purchase separately?

The combo includes the ROG CROSSHAIR X870E APEX motherboard and the Ryzen 9 9900X3D processor. The box also contains the ROG DIMM.2 card for two extra M.2 drives and the ROG Memory Fan kit. You must buy DDR5 memory modules, M.2 SSDs, a graphics card, a power supply, a CPU cooler and a chassis separately.

Which memory speed tier should I target with the Ryzen 9 9900X3D on this board?

With the Ryzen 9000 series CPU installed, the motherboard supports DDR5 up to 8200+ MT/s when overclocked. The ROG Memory Fan and AEMP profiles help stabilize high-frequency kits. Choose a DDR5 kit rated at or near 8200 MT/s for maximum headroom, or a lower-speed kit if you prefer plug-and-play stability.

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