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MSI

MSI MEG X870E ACE MAX + Ryzen 9 9900X3D AMD motherboard CPU combo

SKU CH-VAXK-D5DHS

ATX AM5 combo with 18+2+1 DRPS 110A SPS power, 64MB BIOS, DDR5 up to 9000+ MT/s OC, dual PCIe 5.0 x16, five M.2 slots, 10G and 5G LAN, plus 12-core 120W CPU with 128MB L3 cache and Radeon graphics

  • CPU socketAM5
  • ChipsetAMD X870E
  • Form factorATX
  • South bridgeAMD X870E
  • Memory slot count4 × 288pin (DDR5)
  • Max supported RAM256 GB
  • Supports future CPU upgrades with 64MB BIOS capacity
  • Delivers stable high performance via 18+2+1 DRPS and 110A SPS power
  • Keeps components cool using Frozr Design with wavy fin heatsinks
  • Provides fast networking through onboard 10G and 5G LAN ports
  • Enables rapid DDR5 memory speeds up to 9000+ MT/s when overclocked

AM5 Platform for Zen 5 Processors

This motherboard and CPU bundle pairs the MSI MEG X870E ACE MAX board with a Ryzen 9 9900X3D processor. The AM5 socket supports Ryzen 7000, 8000 and 9000 series chips. Four DDR5 slots accept up to 256 GB of unbuffered non‑ECC memory in dual‑channel mode. The board delivers 18+2+1 DRPS power stages rated at 110 A each, backed by a 64 MB BIOS ROM and OC Engine clock generator.

Built for High‑End Gaming and Heavy Multitasking

The 120 W, 12‑core CPU with 128 MB L3 cache and 12 MB L2 cache suits users who need sustained multi‑thread throughput and large cache for latency‑sensitive workloads. Integrated Radeon graphics cover basic display output without a discrete card. Builders who only need mainstream core counts or who prefer a smaller form factor should consider a different platform.

VRM and Cooling Designed for Continuous Loads

The 110 A SPS power delivery and Frozr heatsink array — wavy fin design, direct‑touch heat‑pipes, aluminium covers, double‑sided M.2 shields and a metal backplate — are engineered to dissipate heat during prolonged all‑core activity. Dual 10 GbE and 5 GbE LAN controllers maintain high network throughput without thermal throttling during extended transfers.

How it compares

Measured against everything we stock in Motherboards for AMD CPUs, at today’s prices. Recalculated every night.

Price $1,415.99
Pricier than about 92% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameMSI
Product lineMEG
Model nameMEG X870E ACE MAX+R9 9900 × 3D
Processor
CPU socketAM5
ChipsetAMD X870E
Memory
Memory slot count4 × 288pin (DDR5)
Max supported RAM256 GB
Memory channelsDual Channel
ECC supportNon-ECC
BufferingUn-buffered
Storage
SATA ports4 x SATA 6Gb/s
M.2 slots5 x M.2 (Support PCIe 5.0 x4 & PCIe 4.0 x4)
SATA and RAID support0/1/10
Audio & video
Audio chipRealtek ALC4082
Sound channels7.1 Channels
Connectivity
Ethernet controllerMarvell AQC113CS, Realtek 8126
Second LAN controllerRealtek 8126
Maximum network speed10 Gbit/s + 5 Gbit/s
Wi-Fi standardWiFi IEEE 802.11 a / b / g / n / ac / ax / be
Bluetooth supportYes
Ports & slots
PCIe 5.0 x16 slots2 x PCI Express 5.0 x16
PCIe 4.0 x16 slots2 x PCI Express 4.0 x16
PCIe x16 slots2 x PCI Express x16
PCIe x4 slots1 x PCI Express x4
Additional slots1 x M.2 (Key-E)
Rear panel ports9 x USB 10 Gbit/s Type-A, 2 x USB 10 Gbit/s Type-C, 2 x USB 40 Gbit/s Type-C, 1 x HDMI, 1 × 10G LAN, 1 × 5G LAN, 1 x Optical S/PDIF-Out
Video connectorsHDMI + 2 x Display Port
HDMI ports1 x HDMI
Ethernet port2 x RJ45
DisplayPort connectors2 x DisplayPort
USB 3.1 ports11 x USB 3.1
USB 3.0 ports4 x USB 3.0
USB 2.0 ports4 x USB 2.0
USB-C ports2 x USB Type-C® port, with USB 40 Gbit/s support; 2 x USB Type-C® port, with USB 10 Gbit/s support; 1 x USB Type-C® port, with USB 20 Gbit/s support
S/PDIF output1 x Optical
Audio jacks5 Ports
Onboard USB headers4 x USB 3.2 + 4 x USB 2.0 + 1 x USB Type-C header, with USB 3.2 Gen 2 × 2
Power
Power connectors24 Pin
Size & build
Form factorATX
Width and length243.84 mm × 304.8 mm
Compatibility
Windows 11 supportSupported
More details
South bridgeAMD X870E
S-videoNo
LightingRGB

Other versions of this model

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Questions about this item

What DDR5 memory speed and capacity do I need already installed to use this motherboard?

The board has four 288-pin DDR5 slots supporting up to 256 GB total in dual-channel mode, and it can run kits rated up to 9000+ MT/s when overclocked.

Will my existing PCIe 4.0 graphics card and SATA drives work with the X870E chipset on this board?

Yes, the board provides two PCIe 5.0 x16 slots, two PCIe 4.0 x16 slots and four SATA 6 Gb/s ports, so current-gen GPUs and SATA SSDs or HDDs remain fully compatible.

How can I confirm the 128 MB L3 cache on the Ryzen 9 9900X3D is active after assembly?

Boot into the 64 MB BIOS or use a system-information tool in Windows; both will report 128 MB of L3 cache for the processor.

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