Bmax B1 Plus

Published on August 2, 2026

The Bmax B1 Plus is a palm-sized Windows 11 mini PC built around the Intel Celeron J3355, a dual-core Apollo Lake chip Intel launched in the third quarter of 2016. It pairs that processor with 6GB of soldered LPDDR3 and 128GB of eMMC storage, then adds two HDMI outputs, gigabit Ethernet, Wi-Fi 5, and Bluetooth 5.0 in a chassis measuring 4.25 by 4.13 by 1.42 inches and weighing under half a pound. Two internal M.2 slots (one SATA, one NVMe) let you move the system onto a real drive later, and a VESA bracket ships in the box so the machine can hide behind a monitor. Bmax still sells it new in 2026, and the chip is the thing to weigh before anything else: it is a decade old, and its PassMark CPU Mark of roughly 1,205 lands below the Celeron N4000 in Bmax’s own older MaxMini B1 Pro.

Pros and Cons of the Bmax B1 Plus

Bmax B1 Plus Comparison Chart

	Bmax B1 Plus
Price	List Price: $169.99 Amazon Prices: Loading prices...
Version	6GB/128GB/Intel J3355
Performance Rating	2.4
Operating System	Windows 11 Home
Processor	Dual-core 2.00 Ghz (max 2.50 Ghz) Intel Celeron J3355
GPU	Integrated Intel HD Graphics 500
RAM	6 GB LPDDR3 (6GB LPDDR3-1600, soldered)
Internal Storage	128 GB eMMC
Dimensions width x length x thickness	4.25 x 4.13 x 1.42 inches (107.95 x 104.9 x 36.07 mm)
Weight	0.49 lbs (0.22 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 2x USB 3.0 front, 2x USB 2.0 rear
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	Mini PC, VESA bracket, 12V power adapter, HDMI cable, user guide
Expandability	Storage only: two M.2 slots (one SATA, one NVMe) up to 2TB. Memory is soldered.

Detailed Information on the Bmax B1 Plus

The chassis measures 4.25 by 4.13 by 1.42 inches and weighs 0.49 pounds, small enough to disappear behind a monitor on the bundled VESA bracket. The front face carries a 3.5mm combo audio jack, two USB 3.0 Type-A ports, a power button, and a recessed clear-CMOS pinhole. The rear holds the 12V barrel jack, a gigabit RJ45 port, two USB 2.0 Type-A ports, and the two HDMI outputs. There is no USB-C anywhere on the box, no DisplayPort, and no card reader, so a modern dock or a camera card needs an adapter. Unlike the fanless MaxMini B1 Pro, this model runs an active fan; Bmax’s own materials describe a “smart fan” paired with a copper heat pipe.

Intel’s spec page for the J3355 lists two cores, two threads, a 2.00 GHz base with a 2.50 GHz burst, 2MB of cache, and a 10W TDP on a 14nm Apollo Lake design launched in Q3 2016, with a recommended customer price of $24. Graphics come from Intel HD Graphics 500 with 12 execution units. PassMark scores the chip at roughly 1,205 on CPU Mark. For scale, the Intel N100 that anchors most current budget mini PCs scores about 5,643 and the N150 about 5,478, so a typical 2026 entry-level box is close to four and a half times quicker on the same benchmark. Intel’s spec page also lists an end-of-servicing-updates date of September 30, 2023 for this part, so no further firmware or microcode is coming from Intel.

Memory is the hardest part of this design to live with. The 6GB of LPDDR3 is soldered to the board, and Intel caps the SoC at 8GB in any case, so there is no upgrade path at all: what you buy is what you keep. The 128GB of onboard storage is eMMC, a flash type closer to what a phone uses than to an SSD, and Windows 11 plus its updates eat into that quickly. The two M.2 slots are the redeeming feature. One runs SATA and one runs NVMe, Bmax rates them for drives up to 2TB, and adding a drive is the only meaningful upgrade this chassis allows. Temper expectations on the NVMe slot, though, because the J3355 provides PCI Express revision 2.0 with six lanes in total, so a current drive cannot reach the speeds it would hit in a newer mini PC.

Two claims on the retail listing need qualifying. The first is display output: the listing advertises 4K at 60Hz, but Bmax’s own port diagram labels both HDMI ports 1.4b, and HDMI 1.4 does not carry enough bandwidth for 4K at 60Hz, topping out at 30Hz instead. Treat the 4K60 line as a vendor claim rather than a specification to plan around, and expect 1080p at 60Hz to be the comfortable working ceiling. The second is the operating system: the machine ships with Windows 11 Home preinstalled, yet Microsoft’s list of Windows 11 supported Intel processors starts at the Celeron J4000 series, and the J3355 is a J3000-series part that does not appear on it. Microsoft’s stated position for hardware that falls outside the Windows 11 requirements is that it is not entitled to receive updates, so plan for the possibility that a future feature update declines to install.

Reviewer Insights on the Bmax B1 Plus

No independent hands-on test of this configuration exists. Searching for “Bmax B1 Plus” coverage turns up an earlier machine that shares the name: a Celeron N3350 version with 64GB of eMMC, a fanless chassis, HDMI plus VGA rather than two HDMI ports, Bluetooth 4.2, and a microSD reader. That is a different chip generation in a different chassis, so its measured results for power draw, storage speed, and thermals do not carry over to the J3355 model on this page. No measured power, thermal, or benchmark data exists for the J3355 model.

What can be stated without a test bench is what the specification already settles: the PassMark figure above, the soldered 6GB ceiling, the eMMC boot drive, the PCIe 2.0 limit on the NVMe slot, and the HDMI 1.4b port labeling. Those five points decide whether this machine fits a job, and none of them change with a firmware update or a fresh Windows install.

Conclusion: Who the Bmax B1 Plus Is For

There is a narrow case for this box. If you need a small, low-power Windows endpoint for one fixed task, such as digital signage, a shop-floor terminal, a kiosk running a single browser tab, or a spare machine parked next to a printer or scanner, then its rated 15W draw, two HDMI outputs, gigabit Ethernet, and a VESA bracket in the box cover the requirement. The two M.2 slots also mean an owner can move Windows off the eMMC and keep the machine useful longer than the stock configuration suggests.

For most other buyers the arithmetic goes the wrong way. Bmax’s own MaxMini B1 Pro runs a faster Celeron N4000 (CPU Mark near 1,432) with 8GB instead of 6GB, while the B4 Plus and B4 Ultra step up to the Intel N100 and N150 and score roughly four and a half times higher on the same benchmark; the N100 in the B4 Plus appears on Microsoft’s supported-processor list, and that model adds a replaceable memory module and a 2.5-inch drive bay on top. Compare against those before committing to this one. For a wider view of what else is on the shelf, see Starry Hope’s Mini PC Comparison Chart.