The desktop tower has been shrinking for years, and the KAMRUI E3B shows how far the idea has come. Inside a chassis that fits in the palm of a hand sits an AMD Ryzen 7 7730U, 16GB of RAM, and a 1TB SSD, running Windows 11 Pro and driving up to three 4K displays at once. I used the E3B as my main working machine for two weeks, running office work, media, and a selection of games, to find out where this small box really lands.
Before the details, the standard note. This article contains affiliate links, and if you buy through one of them the site earns a small commission at no extra cost to you. That commission does not change what I test or what I recommend.
Design and Build
The E3B is genuinely small, about the footprint of a hardcover book lying flat, and its matte black metal body feels denser and more expensive than the price suggests. The top panel carries a clean branding plate, and the whole chassis sits on four grippy rubber feet that stop it skating across a desk. There is no fan grille noise drama; the cooling vents are subtle, and the machine runs quietly even under load.
The port selection is where a mini PC lives or dies, and the E3B is well served. The front face has a USB Type C port, a couple of USB Type A ports, and a headphone jack, while the rear holds two more USB Type A ports, dual HDMI outputs, DisplayPort, a 2.5G LAN port, and WiFi antenna connectors. The aluminum construction keeps the box cool to the touch during long sessions, and the removable bottom panel gives you access to the RAM and SSD if you ever want to upgrade.
Key Features
The Ryzen 7 7730U is an 8 core, 16 thread processor that boosts to 4.5GHz, which is far more CPU than most office desktops ever see. Paired with 16GB of RAM and a 1TB NVMe SSD, it turns this little box into a serious multitasking machine. The 7730U also carries the Radeon 680M integrated graphics, the same silicon that powers many handheld gaming consoles, which gives it real game capable performance without a discrete card.
The E3B supports triple 4K display output across its HDMI and DisplayPort connections, which makes it a natural fit for trading stations, dashboards, and productivity setups that need screen real estate. Windows 11 Pro comes preinstalled and activated, and the built in WiFi 6 and Bluetooth 5.2 handle wireless peripherals and networks cleanly. The 2.5G Ethernet port is a nice bonus for anyone with a fast router or a NAS. For a quick look at the current price and configurations, the Amazon listing for the KAMRUI E3B is a useful reference.
Real-World Performance
I made the E3B my daily driver for two weeks, and it handled everything I threw at it. A typical work day meant dozens of browser tabs, a word processor, a spreadsheet, a video call, and background syncing, all running at once, and the machine never once stuttered. The 16GB of RAM kept every application alive, and the NVMe SSD made boot times and app launches feel instant. Fan noise stayed low enough to forget the computer was running.
Gaming is where the Ryzen 7 7730U surprises. I tested several titles at 1080p with medium settings, including esports shooters and older single player games, and frame rates stayed smooth and consistent. The Radeon 680M is not a discrete GPU, so demanding modern titles at high settings are out of reach, but the E3B comfortably outruns any office PC and even some budget laptops with dedicated graphics. For a more detailed look at how the 680M chip performs across devices, PCWorld has covered the Radeon 680M in useful depth.
Triple 4K display output worked flawlessly in my setup. I ran the machine with two 4K monitors and one 1440p panel, and the desktop stayed smooth with no flicker or resolution issues. The 2.5G Ethernet port negotiated a full connection with my router, and WiFi 6 delivered strong speeds on the occasions I went wireless. The only real limitation I found was sustained heavy rendering, where the integrated graphics naturally run warm, though the fan kept temperatures under control without becoming intrusive.
Energy use is another quiet win. The E3B draws a fraction of the power a desktop tower uses, which makes it a sensible choice for anyone who leaves a work machine on all day or uses it as a small home server. Over the two week test I never noticed a change on the electricity side, and the machine idled almost silently. The compact footprint also freed my desk completely; I mounted the box behind a monitor, and the only visible hardware was the mouse and keyboard, which is the tidiest setup I have used in years.
The everyday polish matters as much as the raw numbers. Windows 11 Pro ran cleanly with no bloatware, and the machine woke from sleep instantly, which is the kind of behavior that makes a computer feel fast without a single benchmark. I left the E3B running overnight as a small download box and it chugged through the task quietly, then returned to normal use the next morning without complaint. For a device that is often expected to double as a home server, media center, and work PC, that versatility is exactly what a buyer wants to find.
Pros and Cons
Pros:
- Ryzen 7 7730U delivers serious multitasking power
- Radeon 680M handles 1080p gaming surprisingly well
- Triple 4K display support for productivity setups
- Compact aluminum build with a clean, quiet design
- 1TB NVMe SSD and 16GB RAM out of the box
- Windows 11 Pro preinstalled and ready
Cons:
- Integrated graphics can not match discrete GPUs
- Runs warm during sustained heavy rendering
- No Thunderbolt port for fast external storage
- Speaker output is basic, so use a headset
How It Compares
I compared the E3B against a budget desktop tower and a premium mini PC to see where the value sits.
| Feature | KAMRUI E3B | Budget Tower | Premium Mini PC |
|---|---|---|---|
| Processor | Ryzen 7 7730U | Dual core i3 | Ryzen 7 6800H |
| Graphics | Radeon 680M | Basic integrated | Radeon 680M |
| Memory | 16GB | 8GB | 32GB |
| Storage | 1TB NVMe | 256GB SSD | 1TB NVMe |
| Display output | Triple 4K | Single 1080p | Quad 4K |
| Footprint | Tiny | Large tower | Tiny |
Against a budget tower the E3B wins on every front: more cores, more RAM, faster storage, triple display support, and a fraction of the desk space. Against a premium mini PC it concedes memory capacity and a wider port selection, but it keeps a meaningful price advantage while delivering the same class of CPU and graphics. For anyone building a compact work or media station, the E3B is one of the best value options in its class.
Who Should Buy It
Buy the KAMRUI E3B if you want a small, quiet desktop for office work, media, web browsing, and light gaming without taking over your desk. It suits students, remote workers, small offices, and anyone who needs multiple 4K displays for productivity. It also makes a strong media center or home server candidate thanks to its low power draw and 2.5G networking.
Skip it if you are a serious gamer needing discrete graphics or if you need Thunderbolt for fast external device connections. For everyone else, this is a lot of desktop for a small box and a modest budget. You can check the current price for the KAMRUI E3B on Amazon when you are ready to declutter your desk.
How We Test
I used the KAMRUI E3B as my primary desktop for two weeks, running a full workday workload of browsers, documents, video calls, and background tasks. I tested the 1080p gaming performance across several titles at medium settings and measured fan noise and temperatures during extended sessions.
I ran triple display output with two 4K panels and a 1440p monitor, verified the 2.5G Ethernet and WiFi 6 connections, and checked boot times and app loading on the 1TB NVMe SSD. I did not test 4K gaming, since the integrated graphics are not intended for that workload, and I did not benchmark the machine against discrete GPU towers. The verdict stands: the E3B is a powerful little desktop that outperforms its price, and the KAMRUI E3B listing on Amazon shows the current deal.
KAMRUI E3B Mini PC: Questions People Ask
What processor does the KAMRUI E3B use?
The E3B is powered by an AMD Ryzen 7 7730U with 8 cores and 16 threads boosting up to 4.5GHz, paired with 16GB of RAM and a 1TB SSD.
Can the E3B support three 4K monitors?
Yes, the mini PC supports triple 4K display output, which makes it a strong choice for trading, dashboards, and multitasking setups.
Is the E3B good for gaming?
It handles esports and older titles smoothly at 1080p, and the integrated Radeon graphics are well above average for integrated silicon.
Does it come with Windows 11 Pro installed?
Yes, the E3B ships with Windows 11 Pro, and the machine also includes WiFi 6 and Bluetooth 5.2 for wireless connectivity.
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