Mini PCs · Head to head

GMKtec NucBox G3 Pro (16GB + 512GB) vs GMKtec NucBox G3S (8GB + 256GB)

Full Mini PCs comparison in 2026

Updated October 2026
Data from Amazon and official GMKtec site.
2026 verdict
Two budget GMKtec boxes, one clear winner: the GMKtec NucBox G3 Pro (16GB + 512GB) leads the GMKtec NucBox G3S (8GB + 256GB) on memory, storage and owner rating.
GMKtec NucBox G3 Pro (16GB + 512GB)
Winner
GMKtec NucBox G3 Pro (16GB + 512GB)
$309.99$459.9933% OFFPrime exclusive deal

Last recorded price

Buy on Amazon USA
The G3 Pro ships 16 GB of DDR4 in two dual-channel slots upgradable to 64 GB and a 512 GB drive with a free second slot, plus 2.5 Gigabit Ethernet, Wi-Fi 6 and four USB-A ports. The G3S counters with a newer N95 processor, two HDMI 2.0 outputs that drive dual 4K at 60 Hz and a lower price, but only a single 8 GB memory slot capped at 16 GB. Neither has USB-C, USB4 or DisplayPort. Buy the G3 Pro for a modest workstation or a home server with room to grow, and the G3S for the cheapest quiet Windows PC behind a monitor.
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FeatureGMKtec NucBox G3 Pro (16GB + 512GB)GMKtec NucBox G3S (8GB + 256GB)Winner
Price$309.99$249.98GMKtec NucBox G3S (8GB + 256GB)
Rating4.44.2GMKtec NucBox G3 Pro (16GB + 512GB)
Memory Capacity16 GB8 GBGMKtec NucBox G3 Pro (16GB + 512GB)
GPU ModelIntel UHD Graphics (up to 1000 MHz)Intel UHD Graphics (up to 1200 MHz)GMKtec NucBox G3S (8GB + 256GB)
Storage Capacity512 GB256 GBGMKtec NucBox G3 Pro (16GB + 512GB)
CPU ModelIntel Core i3-10110UIntel Processor N95Different strengths
Memory ConfigurationDual-channelSingle-channelDifferent strengths
Warranty1 year1 yearTie
Memory TypeDDR4DDR4Tie

What the differences mean

Memory

The GMKtec NucBox G3 Pro (16GB + 512GB) ships 16 GB as two dual-channel modules across two SO-DIMM slots that take up to 64 GB. The GMKtec NucBox G3S (8GB + 256GB) has a single slot and 8 GB, with a hard ceiling of 16 GB.

Storage

The GMKtec NucBox G3 Pro (16GB + 512GB) fits a 512 GB drive and leaves a free M.2 slot. The GMKtec NucBox G3S (8GB + 256GB) starts at 256 GB, so it needs capacity added sooner, though both have two M.2 slots.

Display outputs

The GMKtec NucBox G3S (8GB + 256GB) has two HDMI 2.0 ports that drive dual 4K at 60 Hz, while the GMKtec NucBox G3 Pro (16GB + 512GB) uses HDMI 1.4 and manages dual 4K at 24 Hz. For a smooth desktop the G3S is the better one.

Networking

The GMKtec NucBox G3 Pro (16GB + 512GB) pairs 2.5 Gigabit Ethernet with Wi-Fi 6. The GMKtec NucBox G3S (8GB + 256GB) has Gigabit Ethernet and Wi-Fi 5, which is enough for browsing but not for a fast local network.

USB layout

The GMKtec NucBox G3 Pro (16GB + 512GB) offers four USB 3.2 Gen 1 Type-A ports. The GMKtec NucBox G3S (8GB + 256GB) offers three USB 3.2 Gen 2 Type-A plus one USB 2.0. Neither machine has USB-C or Thunderbolt.

Which one to buy if

Winner
GMKtec

GMKtec NucBox G3 Pro (16GB + 512GB)

33% OFF
Prime exclusive deal
$309.99
$459.99

Last recorded price

Buy on Amazon USA
  • + Rating: 4.4
  • + Memory Capacity: 16 GB
  • + Storage Capacity: 512 GB
  • - Price: $309.99 vs $249.98
  • - GPU Model: Intel UHD Graphics (up to 1000 MHz) vs Intel UHD Graphics (up to 1200 MHz)

What owners say

Owners of both boxes describe a small, quiet PC that takes minutes to set up with Windows 11 Pro already on it, and both groups like the VESA mount that hides it behind a monitor. GMKtec NucBox G3 Pro (16GB + 512GB) owners single out the dual-channel memory, the free second M.2 slot and the 2.5 Gigabit Ethernet port, and warn that the fan is audible under load and that HDMI 1.4 limits dual 4K to 24 Hz. GMKtec NucBox G3S (8GB + 256GB) owners praise how silent it stays and how well the N95 handles browsing, streaming and even light gaming, but flag one memory slot capped at 16 GB, Wi-Fi 5 and listings that have shipped the wrong memory and storage configuration.

Price history compared

Every price change of both, in the same store, so the gap between the two lines is what one costs more than the other.

  • GMKtec NucBox G3 Pro (16GB + 512GB)
  • GMKtec NucBox G3S (8GB + 256GB)

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Frequently Asked Questions

Which is better overall: GMKtec NucBox G3 Pro (16GB + 512GB) or GMKtec NucBox G3S (8GB + 256GB)?

The GMKtec NucBox G3 Pro (16GB + 512GB) is the stronger machine, with double the memory in upgradeable slots, double the storage, 2.5 Gigabit Ethernet and Wi-Fi 6. The GMKtec NucBox G3S (8GB + 256GB) wins only on price, and on smoother dual-4K output through HDMI 2.0.

What is the difference between the GMKtec NucBox G3 Pro (16GB + 512GB) and the GMKtec NucBox G3S (8GB + 256GB)?

Memory, storage and networking. The GMKtec NucBox G3 Pro (16GB + 512GB) has 16 GB of dual-channel DDR4 in two slots up to 64 GB, a 512 GB drive and 2.5 Gigabit Ethernet. The GMKtec NucBox G3S (8GB + 256GB) has 8 GB in a single slot capped at 16 GB, a 256 GB drive and Gigabit Ethernet.

Can either GMKtec mini PC be upgraded?

Both use socketed memory and user-accessible M.2 storage. The GMKtec NucBox G3 Pro (16GB + 512GB) reaches 64 GB of memory and has a free second M.2 slot, while the GMKtec NucBox G3S (8GB + 256GB) tops out at 16 GB in its one slot.

Do the GMKtec NucBox G3 Pro (16GB + 512GB) and the GMKtec NucBox G3S (8GB + 256GB) have USB-C?

No. Both are all USB-A: the GMKtec NucBox G3 Pro (16GB + 512GB) has four USB 3.2 Gen 1 ports and the GMKtec NucBox G3S (8GB + 256GB) has three USB 3.2 Gen 2 plus one USB 2.0. Neither offers USB4, Thunderbolt or DisplayPort.

Which one drives 4K monitors better?

The GMKtec NucBox G3S (8GB + 256GB), with two HDMI 2.0 outputs that run dual 4K at 60 Hz. The GMKtec NucBox G3 Pro (16GB + 512GB) uses HDMI 1.4, so a dual 4K desktop there is limited to 24 Hz.

Who should buy each one?

Buy the GMKtec NucBox G3 Pro (16GB + 512GB) for a home server, a light workstation or anything that may need more memory and storage later. Buy the GMKtec NucBox G3S (8GB + 256GB) for the cheapest quiet Windows PC for browsing, streaming and office work.

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