GMKtec NucBox G3 Pro Review: The Palm-Sized Windows Box Built to Swallow 64 GB of RAM
Two DDR4 SO-DIMM slots, two M.2 drives and a 2.5 Gigabit Ethernet port in a 280 g chassis, with HDMI 1.4 capping the dual 4K output at 24 Hz.
The NucBox G3 Pro is a budget mini PC that spends its money on expandability rather than on the processor. An Intel Core i3-10110U with Intel UHD Graphics drives it, but the interesting part is around the chip: two DDR4 SO-DIMM slots that ship filled in dual-channel and accept up to 64 GB, two M.2 slots (one 2280 PCIe 3.0 and one 2242 SATA), a 2.5 Gigabit Ethernet port and Wi-Fi 6 with Bluetooth 5.2, all in a 114 x 106 x 44 mm plastic box that weighs 280 g and comes with a VESA mount. The catch is the display path: both video outputs are HDMI 1.4, so a dual 4K setup runs at 24 Hz, and there is no DisplayPort, no Thunderbolt and no USB4. If the job is a home server, a light office desktop or a media box that needs headroom in memory and storage rather than in graphics, that trade lands well.
- Home lab and small server builds
- Office work and web browsing
- Memory-hungry multitasking
- VESA-mounted desk setups
- Shared or open-plan offices
Pros
- Two DDR4 SO-DIMM slots, filled in dual-channel and upgradeable to 64 GB
- Two M.2 slots, one 2280 PCIe 3.0 and one 2242 SATA, so the bundled drive leaves a bay free
- 2.5 Gigabit Ethernet instead of the usual gigabit port
- Wi-Fi 6 and Bluetooth 5.2 for current wireless standards
- Four USB 3.2 Gen 1 Type-A ports plus a 3.5 mm audio jack
- Windows 11 Pro pre-installed
- Kensington lock slot on the rear panel
- 114 x 106 x 44 mm and 280 g, with an HDMI cable and a VESA mount included
- Single copper heat pipe cooling with a fan rated below 38 dB
Cons
- Both video outputs are HDMI 1.4, so dual 4K runs at 24 Hz
- No DisplayPort and no Thunderbolt
- No USB4, and every USB port is Type-A
- No NPU, so no on-device AI acceleration
- No SD card reader and no fingerprint sensor
- No built-in speakers or microphone
- External power brick rather than an internal power supply
- Plastic chassis and a one-year warranty
Who is the GMKtec NucBox G3 Pro for?
This is the mini PC for someone whose bottleneck is memory and storage rather than raw processing power. The two SO-DIMM slots are the headline: memory configuration decides how much bandwidth the system gets, and this one runs dual-channel from the factory instead of the single-channel arrangement common at this price, with a 64 GB ceiling for later. Storage follows the same logic, with an M.2 2280 PCIe 3.0 slot and a second M.2 2242 SATA slot, so the bundled 512 GB drive leaves a bay free rather than forcing a swap. Add a 2.5 Gigabit Ethernet port, Windows 11 Pro pre-installed and a chassis that is 114 x 106 x 44 mm and 280 g, and the natural homes for it are a home server, a second desktop, or a machine bolted to the back of a monitor with the VESA bracket that ships in the box.
What stands out on paper
Three specs do the work. The memory subsystem is DDR4 SO-DIMM in a dual-channel pair, upgradeable to 64 GB, which is unusual headroom for a box this cheap and this small. The network port is 2.5 Gigabit rather than the plain gigabit almost every rival in this bracket ships, which matters for anything that moves files across a LAN or serves media. And the dual M.2 design means storage capacity is not a reason to replace the machine later. Around those, the connectivity is current: Wi-Fi 6, Bluetooth 5.2, four USB 3.2 Gen 1 Type-A ports and a 3.5 mm audio jack. Cooling is a single copper heat pipe with a fan the manufacturer rates below 38 dB, and there is a Kensington lock slot on the rear panel, which is the kind of detail that only shows up once the machine is sitting on a shared desk.
What to know before you buy
The display path is where this model gives ground. Both video outputs are HDMI 1.4, so a dual 4K setup is limited to 24 Hz, which is fine for a signage screen or a media player and uncomfortable for a desktop you look at all day. There is no DisplayPort, no Thunderbolt and no USB4, so every peripheral goes through the four Type-A ports, and there is no SD card reader and no fingerprint sensor. Graphics are the integrated Intel UHD engine, and there is no NPU at all, so the on-device AI acceleration that newer chips advertise is simply not part of this machine. The rest of the compromises are the usual ones at this tier: a plastic chassis, an external power brick instead of an internal supply, no built-in speakers or microphone, and a one-year warranty, which is the shortest cover the category tends to offer.
Is the GMKtec NucBox G3 Pro worth it?
It is worth it when the shopping list reads memory, storage and network rather than frame rates. Nothing else at this price reliably combines two SO-DIMM slots with a 64 GB ceiling, two M.2 bays, a 2.5 Gigabit port and a Windows 11 Pro licence in a 280 g box, and the second M.2 slot alone buys years of useful life. Two things should push a buyer up the range instead: needing a 4K desktop at a comfortable refresh rate, which HDMI 1.4 cannot deliver here, or needing modern high-speed connectivity such as USB4, Thunderbolt or DisplayPort, none of which this model has. Neither of those matters much for a server tucked behind a monitor, which is exactly where this machine makes sense.
Frequently asked questions
How much memory can the GMKtec NucBox G3 Pro take?
It has two DDR4 SO-DIMM slots with a 64 GB ceiling. This configuration ships with 16 GB installed as a dual-channel pair, so the upgrade path is a straight swap to larger modules.
Can it drive two 4K monitors?
Yes, but at 24 Hz. The two video outputs are HDMI 1.4, which supports a dual 4K setup at that refresh rate. There is no DisplayPort, so both screens connect over HDMI.
Can I add a second drive?
Yes. There are two M.2 slots, an M.2 2280 PCIe 3.0 and an M.2 2242 SATA, and the 512 GB drive occupies one of them, so the other stays free for expansion.
How fast is its network connection?
The wired port is 2.5 Gigabit Ethernet, which is two and a half times the bandwidth of the gigabit port most mini PCs in this bracket use. Wireless is Wi-Fi 6 with Bluetooth 5.2.
Does it have USB-C, USB4 or Thunderbolt?
No. Connectivity is four USB 3.2 Gen 1 Type-A ports, with no USB4 and no Thunderbolt, so external GPUs and single-cable docks are out of scope for this model.
Does it come with Windows?
Yes, Windows 11 Pro is pre-installed. The box also includes the power adapter, an HDMI cable, a VESA mount with screws and the user manual.
