Updated September 2026
Data from Amazon and official GMKtec site.
2026 verdict
Same brand, two different budgets: the GMKtec NucBox M6 Ultra (32GB + 1TB) is the step-up model in GMKtec's own lineup, and it wins this comparison on faster DDR5 memory, four times the RAM and four times the storage of the GMKtec NucBox G3S (8GB + 256GB). Owner ratings and warranty coverage land in a tie between the two, since GMKtec backs both with the same support terms, so the gap here is purely about hardware tier rather than build quality. The Ryzen 5 7640HS in the GMKtec NucBox M6 Ultra (32GB + 1TB) also adds dual 2.5G Ethernet and a full-featured USB4 port that the four-core N95 in the GMKtec NucBox G3S (8GB + 256GB) cannot offer, useful for a home lab or firewall box. The GMKtec NucBox G3S (8GB + 256GB) undercuts it only on price, which is exactly its role as the entry point of the lineup. Buy the GMKtec NucBox M6 Ultra (32GB + 1TB) for a genuine desktop replacement or home server, and buy the GMKtec NucBox G3S (8GB + 256GB) if a basic Windows box is all that is needed.
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| Feature | GMKtec NucBox G3S (8GB + 256GB) | GMKtec NucBox M6 Ultra (32GB + 1TB) | Winner |
|---|---|---|---|
| Price | $349.99 | $629.99 | GMKtec NucBox G3S (8GB + 256GB) |
| Memory Type | DDR4 | DDR5 | GMKtec NucBox M6 Ultra (32GB + 1TB) |
| Memory Capacity | 8 GB | 32 GB | GMKtec NucBox M6 Ultra (32GB + 1TB) |
| Storage Capacity | 256 GB | 1 TB | GMKtec NucBox M6 Ultra (32GB + 1TB) |
| CPU Model | Intel Processor N95 | AMD Ryzen 5 7640HS | Different strengths |
| Memory Configuration | Single-channel | Dual-channel | Different strengths |
| GPU Model | Intel UHD Graphics (up to 1200 MHz) | AMD Radeon 760M | Different strengths |
| Rating | 4.2 | 4.2 | Tie |
| Warranty | 1 year | 1 year | Tie |
$349.99
- + Price: $349.99
- - Memory Type: DDR4 vs DDR5
- - Memory Capacity: 8 GB vs 32 GB
Winner
21% OFF
$629.99
$799.99
- + Memory Type: DDR5
- + Memory Capacity: 32 GB
- + Storage Capacity: 1 TB
- - Price: $629.99 vs $349.99
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 M6 Ultra (32GB + 1TB)
Loading price history...
Frequently Asked Questions
Which is better overall: GMKtec NucBox G3S (8GB + 256GB) or GMKtec NucBox M6 Ultra (32GB + 1TB)?
The GMKtec NucBox M6 Ultra (32GB + 1TB) wins overall, with faster DDR5 memory and four times the RAM and storage of the GMKtec NucBox G3S (8GB + 256GB). Owner rating and warranty are tied between the two, and the GMKtec NucBox G3S (8GB + 256GB) wins only on price.
What is the biggest difference between the two GMKtec models?
Processor tier and memory generation. The GMKtec NucBox M6 Ultra (32GB + 1TB) runs a six-core Ryzen 5 7640HS with DDR5 memory, while the GMKtec NucBox G3S (8GB + 256GB) runs a four-core Intel N95 with older DDR4 memory.
Why does the GMKtec NucBox M6 Ultra have two Ethernet ports?
It is built with home lab and networking use in mind, so it includes dual 2.5G Ethernet ports for firewall or dual-network setups. The GMKtec NucBox G3S (8GB + 256GB) has only a single Gigabit Ethernet port.
Are the GMKtec NucBox G3S and M6 Ultra rated the same by owners?
Yes, their owner ratings and warranty terms are effectively tied, since GMKtec backs both models the same way. The difference between them is entirely in the hardware they ship with, not in build quality or support.
Who should buy the GMKtec NucBox G3S (8GB + 256GB)?
Buyers who want the cheapest complete Windows machine in GMKtec's lineup, for browsing and office work, should choose the GMKtec NucBox G3S (8GB + 256GB).
Who should buy the GMKtec NucBox M6 Ultra (32GB + 1TB)?
Buyers who want a genuine desktop replacement, a home lab box or dual-network routing, with room to grow, should choose the GMKtec NucBox M6 Ultra (32GB + 1TB).
Full comparison table
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NucBox G3S (8GB + 256GB)
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Mini PCsGMKtecNucBox M2 Pro S (16GB + 1TB)
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Mini PCsGMKtecNucBox M5 Ultra (32GB + 512GB)
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Mini PCsGMKtecNucBox M6 Ultra (32GB + 1TB)
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Mini PCsGMKtecNucBox M7 Ultra (32GB + 512GB)
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