- Dual 2.5 Gbps Ethernet ports provide high-bandwidth connectivity for advanced networking and homelab applications
- Dual DDR5 memory slots support up to 64GB and dual M.2 NVMe slots accommodate up to 4TB of storage
- Rear-mounted USB4 Type-C port provides high-speed external connectivity and peripheral flexibility
- Compact 5.1-inch square footprint includes an out-of-the-box VESA mounting bracket
- Internal cooling fan becomes distinctly audible under heavy multi-threaded processing loads
- Lacks native Thunderbolt certification despite featuring a USB4 port
- No integrated SD card reader or internal 2.5-inch SATA drive support
Overview
Deploying multi-gigabit networking and modern x86 processing into desktop setups often requires navigating awkward compromises between physical footprint and component expandability. The KAMRUI AM21 tackles this balance by packing AMD mobile silicon—ranging up to the 8-core Ryzen 9 6900HX or Ryzen 7 8745HS—into a compact 5.1 x 5.1 x 2.0 in (129.54 x 129.54 x 50.8 mm) chassis. With dual 2.5 Gbps Ethernet controllers and integrated Radeon graphics, the enclosure serves equally well as an unobtrusive general-purpose desktop workstation, a dedicated home firewall, or a compact virtualization node.
Structurally, the chassis emphasizes utility and ease of deployment, featuring a matte polymer casing with clean port access and an included VESA mounting bracket for mounting directly behind a display. Internal access reveals a serviceable layout that avoids soldered memory limitations. The mainboard provides two DDR5-5600 SODIMM slots supporting up to 64GB of RAM, alongside dual M.2 NVMe PCIe 4.0 slots accommodating up to 4TB of solid-state storage. While the platform eschews legacy 2.5-inch SATA bays, the combination of a rear USB4 Type-C port and dual full-size HDMI ports allows flexible peripheral routing and dual 4K external display configurations without requiring external docks.
Under daily productivity workloads and routing operations, the active cooling setup maintains manageable operating levels with minimal acoustic distraction. When sustained processing loads push the multi-threaded cores, however, the internal blower fan ramps up noticeably, producing an audible acoustic profile typical of high-density compact machines. Platform stability under Windows 11 Pro remains consistent with dependable wake-sleep behavior, though prospective users should note the absence of an integrated SD card reader and lack of formal Thunderbolt certification. For homelab builders and power users prioritizing networking density and memory modularity over whisper-quiet peak operation, the system delivers dependable, predictable execution.
Technical Specifications
| Brand | KAMRUI |
| Model | AM21 |
| Processor | AMD Ryzen 9 6900HX (8 cores, 16 threads, 3.30 GHz base, up to 4.90 GHz turbo) / AMD Ryzen 7 8745HS (up to 4.9 GHz) |
| Graphics | Integrated AMD Radeon 680M / AMD Radeon 780M |
| Memory | 16GB / 32GB DDR5 5600 MHz (expandable up to 64GB via 2x SODIMM slots) |
| Storage | 512GB / 1TB M.2 NVMe PCIe 4.0 SSD (expandable up to 4TB via dual M.2 slots) |
| Storage Expansion | 2x M.2 NVMe PCIe 4.0 slots (no internal SATA or 2.5-inch drive support) |
| Networking | Dual 2.5 Gbps Ethernet (RJ-45) |
| Wireless | Wi-Fi 6 (802.11ax), Bluetooth 5.2 |
| Video Outputs | 2x Full-Size HDMI (supports dual 4K displays) |
| Usb Ports | 1x USB4 Type-C (rear), 1x USB-C, 4x USB 3.0 |
| Audio | 3.5mm headphone/microphone combo jack |
| Cooling | Active fan cooling |
| Vesa Mount | Supported (bracket included) |
| Operating System | Windows 11 Pro |
| Dimensions | 5.1 x 5.1 x 2.0 in (129.54 x 129.54 x 50.8 mm) |
Primary Sources & Audited Citations
Recommended Alternatives in Mini PCs
At a Glance
How reliable is the KAMRUI AM21 according to Mizex audits?
An appealing small-form-factor machine for homelab networking and general productivity, provided you do not require whisper-quiet operation under heavy multi-threaded workloads or native Thunderbolt support.
What are the known quirks or drawbacks of the KAMRUI AM21?
Our reliability audit identified the following documented caveats:
- Internal cooling fan becomes distinctly audible under heavy multi-threaded processing loads
- Lacks native Thunderbolt certification despite featuring a USB4 port
- No integrated SD card reader or internal 2.5-inch SATA drive support
What are the key engineering highlights of the KAMRUI AM21?
The top strengths recorded in our evaluation include:
- Dual 2.5 Gbps Ethernet ports provide high-bandwidth connectivity for advanced networking and homelab applications
- Dual DDR5 memory slots support up to 64GB and dual M.2 NVMe slots accommodate up to 4TB of storage
- Rear-mounted USB4 Type-C port provides high-speed external connectivity and peripheral flexibility
- Compact 5.1-inch square footprint includes an out-of-the-box VESA mounting bracket