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used mini pcs

GMKtec

GMKtec NucBox G3 (Intel N100)

The NucBox G3 is GMKtec's basic Intel N100 mini PC in a 114 x 106 x 42.5 mm case. The N100 is a 4-core, 6 W Alder Lake-N chip that handles web browsing, office work, 4K video playback and light home-server jobs such as Home Assistant, Pi-hole or a small file server. Memory is a single DDR4 SO-DIMM, so it always runs single-channel. Storage is one NVMe slot plus a short M.2 2242 slot that only accepts SATA drives. It has one 2.5 GbE port, four USB 3.2 Gen 1 ports and two HDMI outputs, and it runs from a small 12 V brick. It is not a good router or firewall box because it has only one Ethernet port. GMKtec also sold a G3 Plus (N150), G3S (N95) and G3 Pro (Core i3-10110U) under similar names.

Good for

Badges come from the spec rules on each use page, not from guesswork.

GMKtec NucBox G3 mini PC in sage green with a carbon-texture top, three-quarter front view showing the green power button and two blue USB-A ports
Representative photo — AI-generated from real seller photos. Individual listings vary. How we make these →

Specs that matter used

CPU generation
Intel N-series (Alder Lake-N / Twin Lake)
CPU options
Intel Processor N100
Form factor
Consumer mini PC
Memory
DDR4-3200 SO-DIMM (DDR5 not supported), 1 slot
Max RAM (official)
32 GB — 32 GB is GMKtec's stated maximum. Intel's spec page lists 16 GB as the N100's official maximum, so 32 GB works beyond Intel's validated limit.
Storage
1x M.2 2280 NVMe (PCIe 3.0) plus 1x M.2 2242 slot that takes SATA SSDs only; no 2.5-inch bay
Ethernet
1 × 2.5 GbE (Single RJ45 rated 2500/1000/100/10 Mbps)
Wi-Fi
Wi-Fi 6 + Bluetooth 5.2 (Realtek RTL8852BE)
vPro / AMT
No
Power adapter
12 V / 3 A DC brick (36 W), 5.5 x 2.5 mm barrel
Windows 11
CPU generation is on Microsoft's supported list
Spec sources

Check before you buy

General off-lease checks (BIOS passwords, Computrace, missing drive caddies) are in the used mini PC buying checklist.

Buying guide

Which one to buy

Oct 4, 2026

Only 8 G3 listings turned up, all new stock from mostly UK and overseas resellers with $30–120 shipping, so this isn't a market read. They ask about $273–495 delivered, which is new-retail money or more for an N100 box, so check the current new price from GMKtec or a US retailer before you buy. If you do buy here, confirm it's the N100 G3 (not a G3 Plus, G3S or G3 Pro), that RAM and an SSD are installed (the single slot takes up to 32 GB of DDR4), and that the 12 V barrel adapter is included.

Listed now
8
For parts
0
Typical ask
$320–$420
Full range
$241–$495

Snapshot

Live on eBay right now

8 of 8 listed

Snapshot captured — listings may have ended

Delivered prices include shipping as eBay quoted it to a US address on Oct 4, 2026. Many sellers charge by distance, so your total may differ; eBay shows your exact total before you buy.

Prices and availability change daily. The full, current search on eBay shows every matching listing, including new ones since Oct 4, 2026.

See all current listings on eBay ↗eBay search

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