32% OFF
Prime exclusive deal$237.49
$349.99
Join Prime to buy it at $237.49
Updated October 2026
Data from Amazon and official GMKtec site.
2026 verdict
OCuLink, USB4 and DDR5 lift the GMKtec NucBox M8 (16GB + 512GB) well clear of the GMKtec NucBox G3S (8GB + 256GB), making it the stronger mini PC.
The M8 has twice the memory and storage, a faster six-core Ryzen 5 PRO 6650H with Radeon 660M graphics, dual 2.5G Ethernet, Wi-Fi 6E, USB4 and a front OCuLink port for an external GPU. The G3S stays the cheaper, lighter and quieter box for browsing, streaming and office work, and it is the one with a VESA mount in the box. Neither has a fingerprint sensor, the M8's 16 GB is soldered and the G3S caps at 16 GB in a single slot. Pick the M8 for a home lab, light gaming or a future eGPU, and the G3S when the job is everyday Windows.
vs
Winner
19% OFF
Prime exclusive deal$389.99
$479.99
Join Prime to buy it at $389.99
Deals by email
Mini PC prices change while you decide
We follow prices across the catalog and email you the best deals we find.
No spam. Unsubscribe in one click.
| Feature | GMKtec NucBox G3S (8GB + 256GB) | GMKtec NucBox M8 (16GB + 512GB) | Winner |
|---|---|---|---|
| Price | $237.49 | $389.99 | GMKtec NucBox G3S (8GB + 256GB) |
| Rating | 4.2 | 4.1 | GMKtec NucBox G3S (8GB + 256GB) |
| Memory Type | DDR4 | LPDDR5 | GMKtec NucBox M8 (16GB + 512GB) |
| Memory Capacity | 8 GB | 16 GB | GMKtec NucBox M8 (16GB + 512GB) |
| GPU Model | Intel UHD Graphics (up to 1200 MHz) | AMD Radeon 660M (6 cores, 1900 MHz) | GMKtec NucBox M8 (16GB + 512GB) |
| Storage Capacity | 256 GB | 512 GB | GMKtec NucBox M8 (16GB + 512GB) |
| CPU Model | Intel Processor N95 | AMD Ryzen 5 PRO 6650H | Different strengths |
| Memory Configuration | Single-channel | Dual-channel | Different strengths |
| Warranty | 1 year | 1 year | Tie |
What the differences mean
Processor and graphics
The GMKtec NucBox M8 (16GB + 512GB) runs a six-core Ryzen 5 PRO 6650H with Radeon 660M graphics. The GMKtec NucBox G3S (8GB + 256GB) runs a four-core Intel N95 with UHD Graphics, enough for browsing and streaming but not for demanding games.
Memory
The GMKtec NucBox M8 (16GB + 512GB) has 16 GB of LPDDR5-6400 soldered to the board, where the GMKtec NucBox G3S (8GB + 256GB) has 8 GB of DDR4 in a single slot capped at 16 GB. Neither memory can be expanded much.
Storage
The GMKtec NucBox M8 (16GB + 512GB) ships a 512 GB drive and the GMKtec NucBox G3S (8GB + 256GB) a 256 GB one. Both have two M.2 slots, so either can be expanded, but the M8 starts with more room.
Connectivity
The GMKtec NucBox M8 (16GB + 512GB) brings dual 2.5G Ethernet, Wi-Fi 6E, a USB4 Type-C port and a front OCuLink connector. The GMKtec NucBox G3S (8GB + 256GB) has Gigabit Ethernet, Wi-Fi 5 and no USB-C or OCuLink at all.
VESA mount
The GMKtec NucBox G3S (8GB + 256GB) includes a VESA mount and weighs about 260 g, so it hides behind a monitor. The GMKtec NucBox M8 (16GB + 512GB) weighs about 490 g and ships without a VESA mount.
Which one to buy if
- you might add an external GPU later
Only the GMKtec NucBox M8 (16GB + 512GB) has a front OCuLink port and USB4 for an eGPU dock.
- you want the cheapest quiet Windows PC
The GMKtec NucBox G3S (8GB + 256GB) handles browsing, office work and streaming for the least money.
- you need two wired network links
The GMKtec NucBox M8 (16GB + 512GB) has dual 2.5G Ethernet for redundancy or a second subnet.
- you play lighter games
The GMKtec NucBox M8 (16GB + 512GB) pairs Radeon 660M graphics with 16 GB of fast memory.
- you want the PC hidden behind a screen
The GMKtec NucBox G3S (8GB + 256GB) includes a VESA mount and is the lighter, smaller box.
32% OFF
Prime exclusive deal$237.49
$349.99
- + Price: $237.49
- + Rating: 4.2
- - Memory Type: DDR4 vs LPDDR5
- - Memory Capacity: 8 GB vs 16 GB
Winner
19% OFF
Prime exclusive deal$389.99
$479.99
- + Memory Type: LPDDR5
- + Memory Capacity: 16 GB
- + GPU Model: AMD Radeon 660M (6 cores, 1900 MHz)
- - Price: $389.99 vs $237.49
- - Rating: 4.1 vs 4.2
What owners say
Owners of both GMKtec boxes call them compact, quiet and easy to set up with Windows 11 Pro. GMKtec NucBox M8 (16GB + 512GB) owners describe it as fast and reliable for the money, pointing to the OCuLink port, the dual 2.5G Ethernet and smooth 4K playback, with a handful reporting a Windows activation problem or a dead unit out of the box. GMKtec NucBox G3S (8GB + 256GB) owners praise how silent it stays and how well the N95 handles browsing, streaming and light gaming, but flag the single 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 G3S (8GB + 256GB)
- GMKtec NucBox M8 (16GB + 512GB)
Loading price history...
Frequently Asked Questions
Which is better overall: GMKtec NucBox G3S (8GB + 256GB) or GMKtec NucBox M8 (16GB + 512GB)?
The GMKtec NucBox M8 (16GB + 512GB) is the stronger machine, with a newer Ryzen processor, double the memory and storage, dual 2.5G Ethernet, USB4 and OCuLink. The GMKtec NucBox G3S (8GB + 256GB) wins on price, silence and a VESA mount in the box.
What is the biggest difference between the GMKtec NucBox G3S (8GB + 256GB) and the GMKtec NucBox M8 (16GB + 512GB)?
The platform. The GMKtec NucBox G3S (8GB + 256GB) runs a four-core Intel N95 with 8 GB of DDR4 and Wi-Fi 5, while the GMKtec NucBox M8 (16GB + 512GB) runs a six-core Ryzen 5 PRO 6650H with 16 GB of LPDDR5-6400, Wi-Fi 6E and OCuLink.
Can you connect an external GPU to either one?
Only to the GMKtec NucBox M8 (16GB + 512GB), which has a front OCuLink port exposing PCIe Gen4 x4 and a USB4 port as an alternative. The GMKtec NucBox G3S (8GB + 256GB) has no USB-C, USB4 or OCuLink.
Which one is quieter and smaller?
The GMKtec NucBox G3S (8GB + 256GB), which owners describe as practically silent and which weighs about 260 g against 490 g for the GMKtec NucBox M8 (16GB + 512GB). The G3S also includes a VESA mount.
How much memory can each take?
The GMKtec NucBox G3S (8GB + 256GB) has a single DDR4 slot capped at 16 GB. The GMKtec NucBox M8 (16GB + 512GB) has 16 GB of LPDDR5-6400 soldered to the board with no upgrade path, so both are effectively fixed close to what they ship with.
Who should buy each one?
Buy the GMKtec NucBox M8 (16GB + 512GB) for a home lab, dual wired networking, light gaming or a future external GPU. Buy the GMKtec NucBox G3S (8GB + 256GB) for the cheapest quiet desktop behind a monitor for browsing, documents and streaming.
Full comparison table
Compare all 95 Mini PCs side by side
You are looking at two of them. The full table lines up all Mini PCs in the catalog with the same specs, so you can filter by what you need and sort by price or rating.
- 95 Mini PCs
- 41 specs compared
- 38 filters
AsusNUC 15 Pro+ (Ultra 9 32GB + 1TB)
$1902.44
MINISFORUMMS-A2 (Ryzen 9 9955HX 96GB + 2TB)
$2099.00
AsusROG GR70 (RTX 5070 32GB + 2TB)
$2499.00
AsusNUC 13 Pro Slim (i7 16GB + 512GB)
Last priceSep 25, 2026$989.99
Unavailable
MINISFORUMMS-S1 Max (64GB + 2TB)
$2599.00
MINISFORUMMS-03 (Ultra 9 64GB + 1TB)
$2399.00
AppleMac Mini (M4 Pro 24GB + 512GB)
Last priceOct 6, 2026$1499.00
Unavailable
AppleMac Mini (M2 Pro 16GB + 512GB)
Last priceJul 31, 2026$1273.46
Unavailable
AppleMac Mini (M4 16GB + 512GB)
Last priceOct 6, 2026$799.97
Unavailable
GMKtecK17 Plus (32GB + 1TB)
5% OFF$1099.99$1044.99
MINISFORUMG1 Pro (32GB + 1TB)
$1719.00
MINISFORUMMS-S1 Max (128GB + 2TB)
$3799.00
GeekomA9 Mega (128GB + 2TB)
5% OFF$3999.00$3799.00
GMKtecNucBox M7 Ultra (32GB + 512GB)
20% OFF$679.99$543.99
BeelinkMini S13 (N150 12GB + 500GB)
$339.00
BeelinkMini S12 Pro (N100 16GB + 500GB)
$339.00
BeelinkMini S12 (N95 8GB + 480GB)
$279.00
MINISFORUMM1-1390 (32GB + 1TB)
$767.00
MINISFORUMM1 Pro-125H (32GB + 1TB)
$895.00
MINISFORUMUM870 Slim (32GB + 1TB)
$799.00
Mini PCsGMKtecG10 (16GB + 512GB)
4.1(309)$319.99
Mini PCsGMKtecG11 (16GB + 512GB)
4.4(1,916)Last priceOct 6, 2026$339.99
Unavailable
Mini PCsGMKtecNucBox G3 Pro (16GB + 512GB)
4.4(1,916)34% OFF$459.99$303.61- Mini PCsGMKtec
NucBox G3S (8GB + 256GB)
4.2(1,827)32% OFF$349.99$237.49 - Mini PCsGMKtec
K17 Plus (32GB + 1TB)
4.6(53)5% OFF$1099.99$1044.99 
Mini PCsGMKtecNucBox M2 Pro S (16GB + 1TB)
4.4(830)27% OFF$649.99$474.98
Mini PCsGMKtecNucBox M5 Ultra (32GB + 512GB)
4.3(1,003)25% OFF$559.99$419.99
Mini PCsGMKtecNucBox M6 Ultra (32GB + 1TB)
4.2(486)21% OFF$799.99$629.99- Mini PCsGMKtec
NucBox M7 Ultra (32GB + 512GB)
4.5(1,017)20% OFF$679.99$543.99 - Mini PCsGMKtec
NucBox M8 (16GB + 512GB)
4.1(309)19% OFF$479.99$389.99