KAMRUI AM21 Mini Gaming PC Ryzen 9 6900HX - Compact 4K Mini PC

Our review of the KAMRUI AM21 finds a compact mini desktop aimed at power users who need desktop-class performance in a tiny footprint. The single biggest reason to consider this mini PC is its Ryzen 9 6900HX processor, which delivers strong single- and multi-threaded performance for multitasking, video work, and gaming while still fitting into small desks or media centers. The AM21 pairs that CPU with DDR5 memory and NVMe storage options, giving responsive boots and real-world speed for productivity and creative workflows.

Key Features

• AMD Ryzen 9 6900HX: An 8-core, 16-thread Zen3 CPU with up to 4.9GHz turbo that keeps multithreaded tasks and modern games responsive.
• DDR5 4800MHz memory: 16GB onboard provides faster memory bandwidth and supports upgrading to 64GB for heavier multitasking or editing workloads.
• NVMe PCIe storage: 512GB M.2 2280 NVMe SSD offers quick boot and load times and the system supports two NVMe slots for up to 4TB total capacity.
• Quad 4K display outputs: Multiple HDMI 2.1, DP1.4 and USB Type-C with DP support let you drive up to four 4K@60Hz displays for a multi-monitor workstation or creative setup.
• Dual Ethernet and WiFi 6: 2.5Gbps plus 1Gbps RJ45 ports together with WiFi 6 and Bluetooth 5.2 deliver flexible wired and wireless networking options.
• Compact connectivity: A healthy assortment of USB 3.2 Type-A and high-speed USB4 ports covers external storage, peripherals, and display needs.

Who It's For

The AM21 is suited to content creators who need a small desktop that can handle video editing, image processing, and multitasking without a full tower, and to power users who want near-laptop CPU performance in a compact box. Gamers who value CPU performance and integrated Radeon 680M graphics for light to medium gaming at 1080p or for cloud gaming will also appreciate the AM21's balance of size and power.

It is less appropriate for users who require a discrete high-end GPU for heavy 3D rendering or extreme gaming at max settings, and for people who prefer a fanless silent design; while customers praise the quiet operation, the system is not a passive cooler and occasional restarts reported by some should be considered by those needing uninterrupted long-running compute tasks.

Pros & Cons

Pros

• High-performance Ryzen 9 6900HX delivers strong single- and multi-threaded performance in a mini chassis.
• Modern I/O including USB4, multiple HDMI 2.1 and DP outputs supports multi-4K displays and fast peripherals.
• Fast DDR5 memory and NVMe storage give quick boots and snappy app performance, with clear upgrade paths.
• Dual LAN (2.5Gb + 1Gb) plus WiFi 6 and BT5.2 give flexible and robust network connectivity.

Cons

• Integrated Radeon 680M is capable but not a substitute for a discrete GPU for high-end gaming or heavy 3D work.
• Some users reported occasional restart behavior, which may be a concern for continuously running services.

Specifications

CPU	AMD Ryzen 9 6900HX, 8 cores / 16 threads, up to 4.9GHz
Memory	16GB DDR5 4800MHz (supports up to 64GB via 2x32GB)
Storage	512GB M.2 2280 NVMe SSD (dual NVMe slots, supports up to 2x2TB)
Graphics	Integrated AMD Radeon 680M (supports quad 4K@60Hz outputs)
Networking	WiFi 6, Bluetooth 5.2, 2.5Gbps RJ45 + 1Gbps RJ45
Ports & Power	USB4, USB 3.2 Gen2/Gen1, 2x HDMI 2.1, DP1.4, USB-C PD/DP, 19V DC 90W

Our Verdict

The KAMRUI AM21 is a compelling mini PC for creators and power users who need a compact system with a high-performance Ryzen 9 CPU, fast DDR5 memory and NVMe storage, and extensive display and networking options. It represents strong value for anyone wanting a small workstation that can handle editing, multitasking, and light gaming, though those needing a discrete GPU or absolute silence should consider alternatives.

Frequently Asked Questions

Can the memory be upgraded?
Yes, the AM21 ships with 16GB DDR5 and supports upgrading to 64GB via two 32GB DIMMs.

How many NVMe drives are supported?
The system has dual M.2 NVMe slots and can support up to two 2TB drives for a total of 4TB.

Will it run multiple 4K monitors?
Yes, the integrated Radeon 680M and the available HDMI 2.1, DP1.4 and USB-C display outputs can drive up to four 4K@60Hz displays.