Bmax B4 Ultra

The Bmax B4 Ultra is an ultra-compact mini PC that trades computing power for portability. It weighs just over half a pound and measures roughly 4 inches on each side, small enough to sit behind a monitor or tuck into a drawer. The Intel N150 Twin Lake processor is a modest upgrade over the popular N100, providing approximately 15-25% better performance in single and multi-threaded workloads respectively. For web browsing, document editing, and media consumption at an under-$200 price, that is enough machine.

Pros and cons

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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	2.8
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

A 4-inch chassis with dual M.2 slots and a SATA bay

The chassis of the Bmax B4 Ultra measures 4.25 by 4.13 by 1.38 inches and weighs 0.57 lbs. A VESA mounting bracket comes in the box, so the unit can hang directly behind a monitor and turn the display into an all-in-one setup. Connections are spread across the front, rear, and sides, though the short power adapter cord noted by reviewers may require careful placement or an extension.

The Intel N150 is a 6W TDP chip, enough for office applications, web browsing, and HTPC duty on a living-room display. Green Apple Online found 4K YouTube playback smooth and got an 8K clip to run as well. Casual and online games are playable; graphics-heavy AAA titles are beyond what the N150 can drive. Against the N100, the N150 runs approximately 15% faster in single-threaded and 25% faster in multi-threaded tasks.

Two HDMI 2.1 ports drive a pair of 4K displays at once. The rest of the port set is two USB 2.0 ports, two USB 3.0 ports, one USB-C port for data only with no video output, and Gigabit Ethernet. Wireless is WiFi 5 (802.11ac) and Bluetooth 5.0. Storage expands through dual M.2 slots and a 2.5-inch SATA bay, up to 4TB in total, while the soldered LPDDR5 memory keeps RAM fixed at 12GB.

Reviewer Insights

Green Apple Online’s Perspective

Green Apple Online posted a Thai-language hands-on review of this machine (the descriptions below are translated from the Thai narration, not verbatim English quotes) covering 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 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

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 worth the money provided you already have a monitor, keyboard, and operating system, since none are included.

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.

Best as a second machine for office work and streaming

The Bmax B4 Ultra suits people who want a working Windows computer in the smallest possible package at the lowest reasonable price: a secondary workstation, an HTPC, a digital signage player, or a basic office machine where desk space is tight. The Intel N150 improves on the N100 inside the same 6W power envelope, and the price stays under $200.

The soldered LPDDR5 RAM closes off memory upgrades, though the dual M.2 slots and the 2.5-inch SATA bay leave plenty of room for drives. The missing USB-C video output matters if you planned to run a display off that port, since both monitors have to go through HDMI. Starry Hope’s Mini PC Comparison Chart lays out the alternatives side by side.

Frequently Asked Questions