Bmax B4 Ultra

Updated on June 23, 2026

The Bmax B4 Ultra represents a compelling option in the ultra-compact mini PC category, designed for users who prioritize portability and space efficiency over raw computing power. Weighing just over half a pound and measuring roughly 4 inches on each side, this palm-sized device fits comfortably behind a monitor or can be tucked away virtually anywhere. The Intel N150 Twin Lake processor offers a modest upgrade over the popular N100, providing approximately 15-25% better performance in single and multi-threaded workloads respectively. For everyday tasks like web browsing, document editing, and media consumption, the B4 Ultra delivers a surprisingly capable experience at its under-$200 price point.

Pros and Cons of the Bmax B4 Ultra

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Bmax B4 Ultra Comparison Chart

	Bmax B4 Ultra
Price	List Price: $199.99 Amazon Prices: Check Price on Amazon
Version	---
Performance Rating	4.5
Operating System	Windows 11 Pro
Processor	Quad-core 3.60 Ghz Intel Processor N150
GPU	Integrated Intel UHD Graphics
RAM	12 GB LPDDR5
Internal Storage	512 GB
Dimensions width x length x thickness	4.25 x 4.13 x 1.38 inches (107.95 x 104.9 x 35.05 mm)
Weight	0.57 lbs (0.26 kg)
WiFi	Wi-Fi 5 (802.11ac)
Bluetooth	Bluetooth 5.0
Ethernet	1 Ethernet port at 1 Gbps
HDMI	2 Full-Size HDMI Ports
DisplayPort	No DisplayPort
VGA	No VGA Ports
USB Ports	2 USB 2.0, 2 USB 3, 1 USB-C USB-C is data only, no video output capability
Thunderbolt Ports	No
OCuLink	No
Internal SATA Ports	1 SATA port, includes 2.5" drive bay
Card Reader	No Card Reader
Headphone Jack	3.5mm combo
Fanless	No
VESA Mount	Yes
In the Box	--
Expandability	RAM: Soldered LPDDR5 (not upgradeable for this variant), Storage: Dual M.2 slots + 2.5-inch SATA bay

Detailed Insights into the Bmax B4 Ultra

The build quality of the Bmax B4 Ultra reflects thoughtful engineering for its intended use case. The compact chassis measures just 4.25 by 4.13 by 1.38 inches, making it one of the smallest mini PCs available with Intel Alder Lake-N architecture. The included VESA mounting bracket allows the unit to be attached directly behind a monitor, effectively creating an all-in-one setup. Port accessibility is well-considered with connections spread across the front, rear, and sides of the unit, though the short power adapter cord noted by reviewers may require careful placement or an extension.

Performance from the Intel N150 processor positions the B4 Ultra as a capable light-duty workstation. The 6W TDP chip handles office applications, web browsing, and even serves as an excellent HTPC for streaming content. Testing by reviewers confirms smooth 4K video playback from YouTube, with some users reporting acceptable 8K playback as well. Light gaming is possible with casual and online titles, but graphics-heavy AAA games are beyond what the N150 can drive. The N150 runs approximately 15% faster in single-threaded and 25% faster in multi-threaded tasks compared to the N100.

Connectivity options are solid for a mini PC in this class, with dual HDMI 2.1 ports enabling connection to two 4K displays simultaneously. The B4 Ultra includes two USB 2.0 ports, two USB 3.0 ports, a single USB-C port (data only, no video output), and Gigabit Ethernet. WiFi 5 (802.11ac) and Bluetooth 5.0 handle wireless connectivity, though the WiFi performance has been noted as slower than some competitors. For storage expansion, dual M.2 slots and a 2.5-inch SATA bay provide ample upgrade paths despite the soldered RAM limiting memory upgrades.

Reviewer Insights on the Bmax B4 Ultra

Green Apple Online's Perspective

Green Apple Online provides a comprehensive Thai-language hands-on review of the Bmax B4 Ultra (the descriptions below are translated from the Thai narration, not verbatim English quotes), focusing extensively on the unboxing and initial setup. The reviewer emphasizes the compact form factor, holding the whole unit in one palm and noting it weighs a little over 200 grams, only slightly heavier than a mobile phone. A significant portion of the review walks through Windows 11 Pro setup and the F9 BMAX Smart Recovery partition.

On media playback he found 4K YouTube smooth and was genuinely surprised that even an 8K clip technically played, though with some lag at the start and his own internet bandwidth as the real bottleneck. He also put the USB-C port to the test: noting the spec lists no video over it, he connected it to a monitor, saw nothing appear on screen, and concluded the port is data-only with no display output. For light gaming he ran Roblox at full graphics without trouble and called Genshin Impact a pleasant surprise on a machine this small, while heavier titles stay out of reach. He pegs the B4 Ultra as a sensible secondary PC for office work, students, or media consumption.

NotebookCheck's Analysis

According to NotebookCheck's review of the similar B4 Turbo, the N150-equipped Bmax models work well as basic HTPC solutions but shouldn't be expected to handle demanding workloads. The technical review awarded a 58% score, noting that the 6W processor means users shouldn't "expect to get a lot done on the Twin Lake processor" but that it's "sufficient for the most part" for its intended use cases. The review highlighted the easy serviceability and VESA mount support as positives, while pointing out concerns about single-channel RAM configuration and the always-active cooling fan.

Customer Reviews of the Bmax B4 Ultra

Verified owners of the B4 Ultra lean on the same handful of points: a compact, quiet box that boots quickly and handles everyday work, plus dual or single 4K display support. Alexander Rodriguez, a verified buyer, wrote that it "boots up instantly and handles all my daily office work, web browsing, and 4K video streaming without a hiccup," and praised the "dual 4K monitor support." Rahul K., also verified, called the N150 processor "fast and responsive, handling web browsing, office applications, media streaming, and multitasking with ease." Several reviewers, including Chris C., frame it as good value provided you already have a monitor, keyboard, and operating system, since none are included.

The one negative review is worth reading before you buy. Skylar, a verified buyer who left 1 star, reported that the unit "is advertised to come with a m.2 512GB NVMe SSD, but has a much slower M.2 SATA SSD," and concluded "this is false advertisement." They noted the machine still worked fine for their needs, but flagged the mismatch between the listed storage and what shipped. If SSD speed matters to you, confirm the drive type on arrival.

Conclusion

The Bmax B4 Ultra fills a specific niche in the mini PC market: users who need a functional Windows computer in the smallest possible package at the lowest reasonable price. It excels as a secondary workstation, HTPC, digital signage player, or basic office computer where space is at a premium. The Intel N150 provides meaningful improvements over the N100 while maintaining the same efficient 6W power envelope.

Those requiring more computational power should look elsewhere, as the B4 Ultra isn't designed for video editing, heavy multitasking, or demanding applications. The soldered LPDDR5 RAM limits future upgrades, though the dual M.2 slots and SATA bay provide excellent storage expansion options. The lack of USB-C video output is a notable omission for those planning monitor connections through that port.

For users whose needs align with its capabilities, the Bmax B4 Ultra delivers remarkable value. The combination of ultra-compact design, dual 4K display support, genuine Windows 11 Pro, and sub-$200 pricing makes it a strong contender in the entry-level mini PC segment. For those looking to compare options, Starry Hope's Mini PC Comparison Chart provides a valuable resource for evaluating alternatives.

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