KAMRUI E3B

Updated on June 20, 2026

The KAMRUI E3B Mini PC is a 5-inch-square desktop sold with Ryzen 7 PRO 5875U, Ryzen 7 5825U, or Ryzen 5 7430U eight-core, 16-thread mobile chips that suits office work, multitasking, and light gaming. It ships with Windows 11 Pro. The 16GB DDR4 configurations expand to 64GB across two slots, and every build ships a 512GB SSD; on the 16GB builds reviewers measured it at SATA speeds.

The Mini PC supports triple 4K displays via HDMI, DisplayPort, and USB-C for multi-monitor setups. Connectivity options include Wi-Fi 6, Bluetooth 5.2, and a 1Gbps Ethernet port. A VESA mount ships in the box, so the chassis can hang behind a monitor in a home or office setup.

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KAMRUI E3B Comparison Chart

	KAMRUI E3B	KAMRUI E3B	KAMRUI E3B	KAMRUI E3B	KAMRUI E3B
Price	List Price: $399.95 Amazon Prices: Check Price on Amazon	List Price: $369.99 Amazon Prices: Check Price on Amazon	List Price: $379.93 Amazon Prices: Check Price on Amazon	List Price: $339.99 Amazon Prices: Loading prices...	List Price: $349.00 Amazon Prices: Loading prices...
Version	16GB/512GB/Ryzen 7 PRO 5875U	16GB/512GB/Ryzen 7 PRO 5875U	32GB/512GB/Ryzen 7 5825U	32GB/512GB/Ryzen 5 7430U	16GB/512GB/Ryzen 5 7430U
Performance Rating	6.8	6.8	7.7	7.4	6.7
Operating System	Windows 11 Pro	Windows 11 Pro	Windows 11 Pro	Windows 11 Pro	Windows 11 Pro
Processor	Octa-core 2.00 Ghz (max 4.50 Ghz) AMD Ryzen 7 PRO 5875U	Octa-core 2.00 Ghz (max 4.50 Ghz) AMD Ryzen 7 PRO 5875U	Octa-core 2.00 Ghz (max 4.50 Ghz) AMD Ryzen 7 5825U	Hexa-core 2.30 Ghz (max 4.30 Ghz) AMD Ryzen 5 7430U	Hexa-core 2.30 Ghz (max 4.30 Ghz) AMD Ryzen 5 7430U
GPU	Integrated Radeon RX Vega8 Graphics	Integrated Radeon RX Vega8 Graphics	Integrated Radeon RX Vega8 Graphics	Integrated Radeon RX Vega8 Graphics	Integrated Radeon RX Vega8 Graphics
RAM	16 GB	16 GB	32 GB	32 GB	16 GB
Internal Storage	512 GB	512 GB	512 GB	512 GB	512 GB
Dimensions width x length x thickness	5.04 x 5.04 x 1.63 inches (128.02 x 128.02 x 41.4 mm)	5.04 x 5.04 x 1.63 inches (128.02 x 128.02 x 41.4 mm)	5.04 x 5.04 x 1.63 inches (128.02 x 128.02 x 41.4 mm)	5.04 x 5.04 x 1.63 inches (128.02 x 128.02 x 41.4 mm)	5.04 x 5.04 x 1.63 inches (128.02 x 128.02 x 41.4 mm)
Weight	unknown	unknown	unknown	unknown	unknown
WiFi	Wi-Fi 6 (802.11ax)	Wi-Fi 6 (802.11ax)	Wi-Fi 6 (802.11ax)	Wi-Fi 6 (802.11ax)	Wi-Fi 6 (802.11ax)
Bluetooth	Bluetooth 5.2	Bluetooth 5.2	Bluetooth 5.2	Bluetooth 5.2	Bluetooth 5.2
Ethernet	1 Ethernet port at 1 Gbps	1 Ethernet port at 1 Gbps	1 Ethernet port at 1 Gbps	1 Ethernet port at 1 Gbps	1 Ethernet port at 1 Gbps
HDMI	1 Full-Size HDMI Port	1 Full-Size HDMI Port	1 Full-Size HDMI Port	1 Full-Size HDMI Port	1 Full-Size HDMI Port
DisplayPort	1 DisplayPort (Supports 4K@60Hz)	1 DisplayPort (Supports 4K@60Hz)	1 DisplayPort (Supports 4K@60Hz)	1 DisplayPort (Supports 4K@60Hz)	1 DisplayPort (Supports 4K@60Hz)
VGA	No VGA Ports	No VGA Ports	No VGA Ports	No VGA Ports	No VGA Ports
USB Ports	6 USB 3, 1 USB-C (USB-C supports DisplayPort)	6 USB 3, 1 USB-C (USB-C supports DisplayPort)	6 USB 3, 1 USB-C (USB-C supports DisplayPort)	6 USB 3, 1 USB-C (USB-C supports DisplayPort)	6 USB 3, 1 USB-C (USB-C supports DisplayPort)
Thunderbolt Ports	No	No	No	No	No
OCuLink	No	No	No	No	No
Internal SATA Ports	No SATA ports	No SATA ports	No SATA ports	No SATA ports	No SATA ports
Card Reader	No Card Reader	No Card Reader	No Card Reader	No Card Reader	No Card Reader
Headphone Jack	combo	combo	combo	combo	combo
Fanless	No	No	No	No	No
VESA Mount	Yes	Yes	Yes	Yes	Yes
In the Box	E3B Mini PC, Power Adapter & Cable, User Manual, VESA Mount with Screws, HDMI Cable	E3B Mini PC, Power Adapter & Cable, User Manual, VESA Mount with Screws, HDMI Cable	E3B Mini PC, Power Adapter & Cable, User Manual, VESA Mount with Screws, HDMI Cable	E3B Mini PC, Power Adapter & Cable, User Manual, VESA Mount with Screws, HDMI Cable	E3B Mini PC, Power Adapter & Cable, User Manual, VESA Mount with Screws, HDMI Cable
Expandability	Expandable RAM up to 64GB	Expandable RAM up to 64GB	Expandable RAM up to 64GB	Expandable RAM up to 64GB	Expandable RAM up to 64GB

Room for 64GB of RAM and three 4K screens

The Ryzen 7 PRO 5875U runs eight cores and 16 threads at a 2.0 GHz base clock and boosts to 4.5 GHz, which covers web browsing, office productivity, light gaming, and media playback. Radeon RX Vega8 Graphics handles 4K video playback and casual titles, but not intensive 3D rendering or AAA games.

Memory is where the machine has the most headroom. The 16GB of DDR4 RAM in the entry configurations goes to 64GB across two channels, and storage starts at a 512GB SSD that boots quickly but slows down on data-heavy work such as video editing. Two M.2 slots are on board: one takes NVMe or SATA drives, the other SATA only.

Triple 4K displays run off HDMI, DisplayPort, and USB-C at once, and Wi-Fi 6, Bluetooth 5.2, and a 1Gbps Ethernet port cover wired and wireless networking. The chassis measures 5.04 x 5.04 x 1.63 inches and includes a VESA mount, so it can sit behind a monitor or on a wall instead of taking desk space.

Reviewer Insights

The KAMRUI E3B is sold across three AMD APU tiers, which is why independent reviewers ran different chips. The base configuration uses the Ryzen 7 PRO 5875U (Zen 3, eight cores and 16 threads, PassMark multi-thread around 16,512); other listings ship the closely related Ryzen 7 5825U (Zen 3, eight cores, PassMark around 18,350) or the Ryzen 5 7430U (a Zen 2 refresh, six cores and 12 threads, PassMark around 15,985). All three are low-power U-series mobile parts from the 2021 to 2023 era paired with integrated Radeon Vega graphics. By 2026 that puts the E3B in mid-tier territory: fine for office work, browsing, and media, but visibly behind newer 7000 and 8000-series APUs that pair RDNA-based Radeon 780M graphics with dual-channel DDR5.

Tech Brothers: near-silent, with a drive worth replacing

Tech Brothers tested the 16GB/512GB E3B with the Ryzen 7 5825U, which he describes as having “a pretty low typical TDP of 15 W” with “a clock speed of 2 GHz and a turbo frequency of 4.5 GHz.” The machine “used up to 10 W in standby mode,” and under a stress test the package power “rose to 35 W and then dropped to 28 W.” Noise stayed low, with the fan “almost silent in standby mode about 39 dB” and rising “to only 40 dB at the maximum processor load.” He measured the bundled SSD at roughly 518 read and 465 write (megabytes per second), flatly calling it “really slow” and advising a swap.

A Geekbench 6 run returned “1922 points in single core test and 6253 points in multi-core test,” and the unit booted Windows 11 Pro in 19 seconds (against 29 seconds for an AceMagic K1 on the older Ryzen 7 5700U). The 16GB of RAM was the recurring catch. Exporting one minute of a 4K Premiere Pro project took “1 minute and 22 seconds,” slower than a 32GB machine he had tested, leading him to recommend adding a second RAM stick. His bottom line was “for its price under $300, the Cam[rui] E3B is a decent mini computer for home and office,” provided you upgrade the RAM and the SSD.

Michael’s Stinkerings found single-channel memory holding back the Vega GPU

The independent review at Michael’s Stinkerings ran a full benchmark suite on a 5825U unit (“an eight-core processor clocked at 2.0 GHz base and 4.5 GHz boost,” with “16GB of DDR4-3200 RAM” in single channel). CPU-Z returned a single-threaded score of 527.6, and Cinebench 2024 scored “82 pts for the single core benchmark, and 495 pts for multi-core.” During the roughly 11-minute Cinebench multi-core run he watched the all-core boost start around 4.1 GHz while the average core temperature “maxed out at 82 degrees Celsius and kept there for the entirety of the benchmark run”; single-core load stayed cooler, “around 60 degrees Celsius.” Power tracked load closely, peaking “around 43 watts” in multi-core and hovering “around 21 watts” single-core.

The “M.2 SATA SSD is undoubtedly slow with read speed barely over 513 MB/s and write speed significantly under,” and the cooling was effectively inaudible: at arm’s length he “can’t hear the fan running with an ambient noise floor of 39 dBA, measured by Decibel X.” His main technical criticism is that the single-channel 16GB DDR4 limits the integrated Vega GPU, and he frames the Zen 3 silicon as “even two generations older than the 12th gen i7,” steering graphics-minded buyers toward newer 7000-series APUs with Radeon 780M and DDR5. For its intended use he is positive: priced under $300, he calls it “a cost-effective workhorse for office environments.”

Anthony Spadafora ran the PRO 5875U build as a daily driver for a month

Anthony Spadafora reviewed the PRO 5875U configuration for Tom’s Guide, concluding it is “a budget mini PC that punches above its weight.” He notes the “Ryzen 7 PRO 5875U CPU with 8 cores, 16 threads, 16MB of L3 cache” that “can reach as high as 4.5GHz” alongside Radeon RX Vega 8 graphics, and praises the near-silent operation: in daily use “it’s been almost completely silent,” and even listening closely the fan “isn’t anything like the much louder one” on a competing mini PC.

Gaming was modest. In Sid Meier’s Civilization VI: Gathering Storm the E3B “was only able to reach 19 fps at 1080p (10 fps at 4K).” Storage drew criticism too. The “included 512GB Netac G537N M.2 SSD has a max sequential read speed of 560 MBps and a max sequential write speed of 520 MBps,” but in a 25GB file copy test the drive “had a write speed of 449 MBps,” with noticeable slowdowns under heavy multitasking. At sale prices as low as $269 he still rates it a good buy for productivity.

FSR upscaling lifted Carl’s 7430U build to 60 fps

Carl at TechfulGoodies looked at the 32GB/512GB E3B built on the Ryzen 5 7430U, which (unlike the 16GB units) runs its RAM in dual channel and ships an NVMe drive. He is candid that “you’re not going to be playing high-end games, which is fine. That’s not why you buy this particular mini PC.” PGA Tour 2K23 ran “about a 29 frame per second” at default settings, but enabling AMD FSR upscaling (Performance mode, Medium quality) pushed it to “a solid 60 frames per second.” More demanding titles topped out lower, with Elden Ring and Hogwarts Legacy both sitting “about 30 frames per second” on low settings. He frames the E3B as an entertainment-center or office machine that can also handle light esports, not a AAA gaming box.

korguenkomodo timed the same render against a MacBook M2

In a Spanish-language review, korguenkomodo put a 5825U E3B through everyday tasks rather than synthetic benchmarks. He reports the chip running from 2.0 GHz up to 4.5 GHz within a 15W to 28W envelope, handling web browsing, two simultaneous YouTube streams, and external-drive file transfers without stutter, and he never felt the unit get warm during the session. The project that rendered in roughly 9 minutes on a MacBook M2 took about 35 minutes on the E3B, which he attributes to the slow internal SSD (he estimates the M2’s storage is around four times faster). He also confirms the headline connectivity (triple 4K output, Wi-Fi 6, and a USB-C port rated for 10Gbps transfers at 4K/60Hz) and the expandability to 64GB of RAM. His overall take is positive on the chassis, ports, and processor, with the slow stock SSD as his one complaint.

Customer Reviews

Across 189 ratings on Amazon, the KAMRUI E3B averages 4.3 stars, with about 69 percent leaving five stars and roughly 10 percent leaving a single star. Marc G., a verified buyer, wrote “If you get it on sale it is a great little pc for media and light gaming.” Several five-star reviewers also called out responsive seller support when they emailed for setup help.

SARAH STAR, a verified buyer who rated it three stars, found it underpowered for her son’s gaming: “Slower than I expected and not that great for gaming.” More seriously, a verified buyer named Anik dropped to a low rating after the unit failed around five months in with repeated blue screens and reboots during video playback (he raised the score back to four stars only because the seller issued a full refund), and a one-star verified review from James reports a unit that “won’t stay on for more than 15 minutes before just turning off.”

Read more owner reviews on Amazon.

A capable office desktop once you swap the stock drive

Eight cores, three 4K outputs, Wi-Fi 6, and Bluetooth 5.2 cover the work most desks need, and the chassis mounts behind a monitor instead of sitting on one. That combination suits home office users who want the desktop out of the way, and the 64GB memory ceiling gives the machine somewhere to go a year or two in.

Budget for a replacement SSD on top of the purchase price, because three of the reviewers above measured the stock drive at SATA speeds and video work is where that shows. Anyone who wants a fanless machine or 3D rendering performance should look elsewhere. Decide between a 16GB build and a 32GB build first, then compare the specs against other boxes in Starry Hope’s Mini PC Comparison Tool.

Frequently Asked Questions