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ATX motherboard with CPU installed, dark metal heatsinks, silver accents, multiple M.2 shields, rear I/O panel visible

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 Socket TypeAM5
  • ChipsetAMD X870E
  • South BridgeAMD X870E
  • Number of Memory Slots4x288pin (DDR5)
  • Maximum Memory Supported256GB
  • Channel SupportedDual Channel

CPU +Ryzen 9 9900X3D

  • 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.

Highlights

  • 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

Specifications

BrandMSI
SeriesMEG
ModelMEG X870E ACE MAX+R9 9900X3D
CPU Socket TypeAM5
ChipsetAMD X870E
South BridgeAMD X870E
Number of Memory Slots4x288pin (DDR5)
Maximum Memory Supported256GB
Channel SupportedDual Channel
ECC SupportedNon-ECC
Buffer SupportedUn-buffered
PCI Express 5.0 x162 x PCI Express 5.0 x16
PCI Express 4.0 x162 x PCI Express 4.0 x16
PCI Express x162 x PCI Express x16
PCI Express x41 x PCI Express x4
Other Slots1 x M.2 (Key-E)
Serial ATA (SATA)4 x SATA 6Gb/s
M.25 x M.2 (Support PCIe 5.0 x4 & PCIe 4.0 x4)
SATA RAID0/1/10
Audio ChipsetRealtek ALC4082
Audio Channels7.1 Channels
LAN ChipsetMarvell AQC113CS, Realtek 8126
Second LAN ChipsetRealtek 8126
Max LAN Speed10Gbps + 5Gbps
Wireless LANWiFi IEEE 802.11 a / b / g / n / ac / ax / be
BluetoothYes
Back I/O Ports9 x USB 10Gbps Type-A, 2 x USB 10Gbps Type-C, 2 x USB 40Gbps Type-C, 1 x HDMI, 1 x 10G LAN, 1 x 5G LAN, 1 x Optical S/PDIF-Out
Video PortsHDMI + 2 x Display Port
S-VideoNo
HDMI1 x HDMI
RJ452 x RJ45
DisplayPort2 x DisplayPort
USB 3.111 x USB 3.1
USB 3.04 x USB 3.0
USB 1.1/2.04 x USB 2.0
USB Type-C2 x USB Type-C® port, with USB 40Gbps support; 2 x USB Type-C® port, with USB 10Gbps support; 1 x USB Type-C® port, with USB 20Gbps support
S/PDIF Out1 x Optical
Audio Ports5 Ports
Onboard USB4 x USB 3.2 + 4 x USB 2.0 + 1 x USB Type-C header, with USB 3.2 Gen 2x2
Form FactorATX
LED LightingRGB
Dimensions (W x L)243.84mm x 304.8mm
Power Pin24 Pin
Windows 11Supported

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 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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