MSI Cubi NUC AI Plus 3MG specifications and in-depth review

MSI Cubi NUC AI Plus 3MG

Manufacturer: MSI

The MSI Cubi NUC AI Plus 3MG is a small-form-factor Mini PC designed to deliver a notable range of capabilities within a compact enclosure measuring just 119.6 mm wide, 115.2 mm deep, and 37.5 mm tall. Built around a processor with big.LITTLE architecture combining multiple core clusters running at varying clock speeds up to a 4.9 GHz turbo frequency, the system balances efficiency and responsiveness for a variety of workloads. It ships with 32GB of DDR5 memory and a 1TB NVMe SSD, while supporting up to 128GB of RAM across two memory channels at speeds reaching 8533 MHz.

On the connectivity front, the MSI Cubi NUC AI Plus 3MG is well-equipped, offering two Thunderbolt 4 ports alongside two USB 4 40Gbps ports, complemented by USB 3.2 Gen 2 options in both Type-A and Type-C form factors. Display output is handled through two HDMI 2.1 ports and two DisplayPort outputs, with integrated graphics capable of driving up to four screens simultaneously and supporting DirectX 12 Ultimate and OpenCL 3. Networking includes Wi-Fi 7 (802.11be) across multiple Wi-Fi generations, Bluetooth 5.4, and dual RJ45 Ethernet ports, rounding out a connectivity profile suited to demanding desktop use cases in a compact footprint.

Pros
  • Supports up to four simultaneous display outputs through two HDMI 2.1 and two DisplayPort connections, enabling flexible multi-monitor configurations
  • Two Thunderbolt 4 ports and two USB 4 40Gbps ports provide high-bandwidth device and peripheral connectivity in a compact chassis
  • Wi-Fi 7 support alongside Bluetooth 5.4 ensures the system is equipped with current-generation wireless standards
  • Memory is expandable up to 128GB across two channels at speeds reaching 8533 MHz, offering meaningful headroom beyond the standard 32GB configuration
  • The 1TB NVMe SSD delivers fast storage access without relying on slower flash-based solutions
  • Dual RJ45 ports allow simultaneous wired Ethernet connections, useful for networking-intensive setups
Cons
  • The one-year warranty period is relatively short for a desktop Mini PC used in demanding or professional environments
  • No external memory slot is available, limiting expandable storage options beyond the internal SSD
  • A 25W TDP processor, while power-efficient, places a ceiling on sustained computational throughput for heavier workloads
  • The chassis includes only one USB 2.0 port and one USB 3.2 Gen 2 Type-A port, which may be limiting when connecting multiple legacy or standard-speed peripherals
  • No S/PDIF output is available, restricting digital audio output options for users requiring that interface
Who is this for?

This Mini PC is well-suited to users who need a capable desktop system in a space-constrained environment, such as home offices, small workspaces, or digital signage setups. The ability to drive up to four displays simultaneously through a combination of HDMI 2.1 and DisplayPort outputs makes it a practical choice for multi-monitor productivity workflows. Users who rely on fast peripheral connectivity will benefit from the two Thunderbolt 4 and two USB 4 40Gbps ports, while dual RJ45 Ethernet and Wi-Fi 7 support cater well to networking-intensive tasks or environments requiring both wired and wireless connections. The 32GB of DDR5 RAM and 1TB NVMe SSD also make it a reasonable fit for professionals handling moderate data workloads who need responsive storage and memory headroom.

Who is this NOT for?

Users with demanding computational workloads — such as video rendering, 3D modelling, or large-scale data processing — may find the 25W TDP processor a limiting factor, as its sustained throughput is constrained by its power envelope. The system is equally unsuitable for those requiring dedicated graphics performance, since it relies entirely on integrated GPU capabilities, which are insufficient for gaming at high settings or GPU-accelerated creative workloads. Additionally, users who need extensive legacy peripheral support may be frustrated by the limited USB 2.0 and USB 3.2 Gen 1 availability, and the absence of an external memory slot means those needing flexible on-the-go storage expansion will find the system poorly equipped for that purpose.

General info:

SSD storage capacity 1000GB
form factor Micro-ATX
Is an NVMe SSD
thickness 115.2 mm
height 37.5 mm
width 119.6 mm
volume 516.672 cm³

The MSI Cubi NUC AI Plus 3MG follows a Micro-ATX form factor while maintaining a notably compact footprint, measuring 119.6 mm wide, 115.2 mm deep, and just 37.5 mm tall, resulting in a total volume of 516.672 cm³. Storage is handled by a 1000GB NVMe SSD, offering fast read and write access through the NVMe interface. Despite its small dimensions, the chassis accommodates these components within a well-defined physical envelope suited to space-constrained deployments.

CPU:

Thermal Design Power (TDP) 25W
CPU speed 4 x 2.1 & 8 x 1.6 & 4 x 1.6 GHz
turbo clock speed 4.9GHz
CPU threads 16 threads
Has integrated graphics
L3 cache 18 MB
Turbo Boost version 2
Supports 64-bit
CPU temperature 100 °C

The processor operates within a 25W TDP envelope, with base clock speeds distributed across three core clusters running at 4 x 2.1 GHz, 8 x 1.6 GHz, and 4 x 1.6 GHz respectively, and a turbo clock speed reaching up to 4.9 GHz via Turbo Boost version 2. It supports 16 threads and includes an 18 MB L3 cache, alongside integrated graphics and full 64-bit instruction support. The maximum rated CPU temperature is 100 °C, providing a clear thermal ceiling for the chip under sustained load.

Graphics card:

GPU turbo 2500 MHz
PCI Express (PCIe) version 5
DirectX version DirectX 12 Ultimate
OpenGL version 4.6
OpenCL version 3
supported displays 4

The integrated graphics solution runs at a turbo frequency of 2500 MHz and connects via PCIe 5, providing a modern, high-bandwidth interface. It supports DirectX 12 Ultimate along with OpenGL 4.6 and OpenCL 3, covering a broad range of graphics and compute workloads. The GPU can drive up to four displays simultaneously, making it a capable option for multi-monitor setups within this compact Mini PC form factor.

Memory:

RAM 32GB
DDR memory version 5

The MSI Cubi NUC AI Plus 3MG comes equipped with 32GB of DDR5 RAM, reflecting the use of the fifth generation of DDR memory technology, which operates at higher frequencies and with improved efficiency compared to its predecessors. This memory configuration provides a solid foundation for handling multitasking and data-intensive applications within the system's compact chassis.

Connectivity:

Wi-Fi version Wi-Fi 6E (802.11ax), Wi-Fi 6 (802.11ax), Wi-Fi 4 (802.11n), Wi-Fi 5 (802.11ac), Wi-Fi 7 (802.11be)
supports Wi-Fi
Has Bluetooth
Bluetooth version 5.4
USB 2.0 ports 1
USB 3.2 Gen 2 ports (USB-A) 1
USB 3.2 Gen 1 ports (USB-A) 0
USB 3.2 Gen 2 ports (USB-C) 1
USB 4 40Gbps ports 2
USB 4 20Gbps ports 0
USB 3.2 Gen 2x2 ports 0
USB 3.2 Gen 1 ports (USB-C) 0
Thunderbolt 4 ports 2
Thunderbolt 3 ports 0
DisplayPort outputs 2
HDMI version HDMI 2.1
HDMI ports 2
RJ45 ports 2
has a socket for a 3.5 mm audio jack
has a VGA connector
Has S/PDIF Out port

Wireless connectivity covers Wi-Fi 4, 5, 6, 6E, and Wi-Fi 7 (802.11be), alongside built-in Bluetooth 5.4. On the wired side, two RJ45 ports provide dual Ethernet connectivity, while the USB layout includes one USB 2.0 port, one USB 3.2 Gen 2 Type-A, one USB 3.2 Gen 2 Type-C, and two USB 4 40Gbps ports — though there are no USB 3.2 Gen 1, Gen 2x2, or USB 4 20Gbps ports present. High-speed device connectivity is further reinforced by two Thunderbolt 4 ports, with no Thunderbolt 3 ports included. Display outputs consist of two HDMI 2.1 ports and two DisplayPort outputs, while a 3.5 mm headset jack handles audio; there is no VGA connector and no S/PDIF output.

Benchmarks:

Miscellaneous:

maximum memory amount 128GB
has an external memory slot
Type Laptop
instruction sets MMX, F16C, FMA3, AES, AVX, AVX2, SSE 4.1, SSE 4.2
Has NX bit
memory channels 2
RAM speed (max) 8533 MHz
Uses big.LITTLE technology
warranty period 1 years
Uses flash storage

The system supports up to 128GB of RAM across two memory channels, with a maximum RAM speed of 8533 MHz, though it does not include an external memory slot or use flash storage. The processor is of the laptop type and employs big.LITTLE technology for its core configuration, with supported instruction sets including MMX, F16C, FMA3, AES, AVX, AVX2, SSE 4.1, and SSE 4.2. Security is addressed through NX bit support, and the unit ships with a one-year warranty period.

Final Verdict

The MSI Cubi NUC AI Plus 3MG presents a well-rounded Mini PC for users who prioritize connectivity versatility and a compact footprint over raw computational power. Its standout characteristic is an exceptional I/O configuration — particularly the two Thunderbolt 4 ports, dual USB 4 40Gbps ports, and four-display output support — which sets it apart within its category and makes it genuinely useful for productivity-driven, multi-monitor desktop environments. Backed by 32GB of DDR5 RAM, a 1TB NVMe SSD, Wi-Fi 7, and dual Ethernet, the system covers the fundamentals of a modern compact desktop comprehensively. That said, its 25W processor and integrated-only graphics mean it is best matched to users whose workloads stay within moderate boundaries. For those needs, the Cubi NUC AI Plus 3MG is a coherent and capable system that makes efficient use of its compact form factor.