KAMRUI AM21 Mini PC

Updated on June 20, 2026

The KAMRUI AM21 is a compact mini PC that delivers strong performance in a small form factor. Powered by the AMD Ryzen 9 6900HX processor with eight cores and 16 threads, it offers a base clock speed of 3.30 GHz and a turbo boost up to 4.90 GHz. This Mini PC is equipped with 16GB of DDR5 RAM (expandable up to 64GB) and a 512GB NVMe SSD, making it well-suited for multitasking, productivity, and even light gaming. Wi-Fi 6, Bluetooth 5.2, and dual Ethernet ports (2.5 Gbps and 1 Gbps) cover fast, reliable connectivity.

With its compact dimensions of 5.1 x 5.1 x 2 inches, the KAMRUI AM21 is easy to integrate into any workspace or entertainment setup. It supports dual 4K displays via its two HDMI ports and features a USB 4 port for high-speed data transfer and expandability. It is a practical option for users who want a balance of performance, connectivity, and portability.

| Pros | Cons | |--------------------------------------------------------------------------|--------------------------------------------------------------------------| | Compact design with VESA mount support for flexible placement | No built-in card reader for additional storage options | | High-performance AMD Ryzen 9 6900HX processor with integrated Radeon 680M GPU | Not fanless so that it may produce some noise during heavy workloads | | Expandable RAM (up to 64GB) and storage (up to 4TB via M.2 slots) | Limited to two M.2 slots, no SATA or 2.5" drive support | | Dual Ethernet ports (2.5 Gbps and 1 Gbps) for advanced networking setups | Lacks Thunderbolt support despite having USB 4 | | Supports dual 4K displays via HDMI | Slightly thicker than some other Mini PCs at 2 inches | | Includes USB 4 and multiple USB 3.0 ports for connectivity | No dedicated GPU for demanding gaming or professional graphics tasks |

KAMRUI AM21 Mini PC Comparison Chart

	KAMRUI AM21 Mini PC
Price	List Price: $599.00 Amazon Prices: Check Price on Amazon
Version	16GB/512GB/Ryzen 9 6900HX
Performance Rating	7.9
Operating System	Windows 11 Pro
Processor	Octa-core 3.30 Ghz (max 4.90 Ghz) AMD Ryzen 9 6900HX
GPU	Integrated AMD Radeon 680M
RAM	16 GB
Internal Storage	512 GB
Dimensions width x length x thickness	5.1 x 5.1 x 2 inches (129.54 x 129.54 x 50.8 mm)
Weight	unknown
WiFi	Wi-Fi 6 (802.11ax)
Bluetooth	Bluetooth 5.2
Ethernet	2 Ethernet ports at 2.5 Gbps
HDMI	2 Full-Size HDMI Ports
DisplayPort	No DisplayPort
VGA	No VGA Ports
USB Ports	4 USB 3, 1 USB 4, 2 USB-C (USB-C on back is USB 4)
Thunderbolt Ports	No
OCuLink	No
Internal SATA Ports	No SATA ports
Card Reader	No Card Reader
Headphone Jack	combo
Fanless	No
VESA Mount	Yes
In the Box	KAMRUI AM21 Mini Computer AMD Ryzen 9 6900HX, 1 x HDMI Cable, 1 x VESA Mount, 1 x Power Adapter, 1 x User Manual
Expandability	Supports up to 64GB RAM and up to 4TB storage via M.2 slots

Detailed Look at the KAMRUI AM21 Mini PC

The KAMRUI AM21 is built around the AMD Ryzen 9 6900HX, an 8-core, 16-thread processor with integrated AMD Radeon 680M graphics. That combination handles video editing, software development, and casual gaming, and the 680M manages light 3D workloads and 4K video playback well.

Connectivity is a strength of the KAMRUI AM21. It has dual Ethernet ports (2.5 Gbps and 1 Gbps), useful for file sharing or running a home server, plus Wi-Fi 6 and Bluetooth 5.2 for wireless peripherals and internet. The Mini PC supports dual 4K displays via its two HDMI ports, making it suitable for multitasking or creating a compact workstation setup.

Expandability is a key feature of this Mini PC. With 16GB of DDR5 RAM pre-installed, users can upgrade to a maximum of 64GB for demanding applications. Thanks to the two M.2 slots, storage is also flexible, one of which comes populated with a 512GB NVMe SSD. The second slot allows for additional storage expansion, supporting up to 4TB. However, the lack of SATA or 2.5" drive support may limit options for users who prefer traditional hard drives. Despite this, the KAMRUI AM21 is a well-rounded package for a compact desktop.

Reviewer Insights on the KAMRUI AM21

Independent, hands-on reviews of the KAMRUI-branded AM21 with the Ryzen 9 6900HX are scarce. Most of the "KAMRUI AM21" coverage circulating online actually tests the newer Ryzen 7 8745HS configuration, which is a different machine that Starry Hope covers on its own KAMRUI AM21 8745HS page. The same chassis is also sold under the Nipogi label, so a fair amount of what reads like AM21 review footage is white-label coverage of identical hardware under another brand. Rather than borrow figures from a unit we cannot tie to this exact product, here is what can be stated with confidence about the silicon inside it.

The Ryzen 9 6900HX is a Zen 3+ part that AMD launched in 2022. It pairs eight cores and sixteen threads at a 3.3 GHz base and a 4.9 GHz boost with the integrated Radeon 680M (RDNA 2). On PassMark's multi-thread test it lands around 24,887, which in 2026 places it in the budget-to-midrange tier: comfortably ahead of the Intel N100/N150 class found in cheaper mini PCs, yet a generation or two behind current Zen 4 and Zen 5 mobile chips (the 8745HS in the sibling model is itself the newer Zen 4 generation). For everyday productivity, multi-monitor office work, 4K video playback, and light 1080p gaming on the 680M, that is ample headroom; for sustained heavy multi-threaded rendering or encoding it shows its 2022 vintage.

Where the AM21 does have a track record is in owner feedback rather than press reviews, and that record is mixed. The Customer Reviews section below collects verified-buyer reports from Amazon, where praise for the speed and small footprint sits alongside repeated complaints about thermal behavior and unit-to-unit reliability. Treat the chip's specifications as the dependable part of the picture and the build quality as the variable worth testing inside your return window.

Customer Reviews of the KAMRUI AM21 Mini PC

Across 30 ratings on Amazon, the KAMRUI AM21 Mini PC averages 3.6 stars, and that score reflects a genuinely split set of owner experiences. A little over half the ratings are five stars, but roughly a third land at one or two stars, and the reviews map cleanly onto that divide. When the unit works, buyers are enthusiastic about its speed, size, and quiet operation: a verified buyer named Paulandsharron called it "a perfect solution for general office support working extremely well with Windows 11 and all the standard O365 products," and verified buyer Washington Irving praised it as a Linux machine that "Outperforms a $2K full size PC built in 2019," noting everything worked out of the box on Debian except WiFi. Verified buyers also point to the dual NVMe slots and gaming capability as highlights.

The low ratings, though, cluster around hardware reliability and should not be glossed over. Multiple verified owners report units that died or became unstable: Justbeinjustin wrote that the machine was "amazing at first" but "then... it suddenly just stopped. Nothing, no power. No boot menu," zach returned his after it "Would either freeze or restart before windows could even be configured," and Gary Heitz described frequent blue-screen restarts. Verified buyer hardwear31 separately reported that the advertised multi-4K display support and WiFi 6 card were "what turned out to be defective," with the display blacking out and WiFi running at a fraction of normal bandwidth. If you buy this Mini PC, plan to test it thoroughly within the return window. Read more owner reviews on Amazon.

Conclusion: Who Is the KAMRUI AM21 Best For?

The KAMRUI AM21 is a strong pick for users who need a compact, capable mini PC for productivity, light gaming, or multimedia. If you want even more power, consider the KAMRUI AM21 8745HS with the newer Ryzen 7 processor. Its Ryzen 9 6900HX processor, expandable RAM and storage, and dual Ethernet ports make it particularly appealing for professionals, remote workers, and tech enthusiasts who value flexibility and power in a small form factor. The ability to support dual 4K displays also makes it a great option for multitasking or creating a streamlined workstation.

However, this Mini PC might not be the best fit for users who require absolute silence, as the fan noise can be noticeable during heavy workloads. Additionally, those needing SATA or 2.5" drive support or Thunderbolt connectivity may want to explore other options. For users who prioritize Thunderbolt, the Beelink SER6 6900HX offers similar performance with Thunderbolt support.

One buying note: the AM21 6900HX listing was showing as currently unavailable when checked (common for this white-label brand), so confirm stock and that the listing still names the 6900HX before ordering. To explore and compare more options, see Starry Hope's Mini PC Comparison Tool.

Frequently Asked Questions