29% OFF
$249.99
$349.99
Updated November 2026
Data from the official GMKtec site.
2026 verdict
Same GMKtec family, different tier: the GMKtec NucBox M5 Ultra (32GB + 512GB) is the stronger mini PC of this pair, shipping four times the installed memory, double the SSD capacity and an eight-core AMD Ryzen 7 7730U in place of the four-core Intel Processor N95 inside the GMKtec NucBox G3S (8GB + 256GB). It also adds an eight-core Radeon iGPU clocked to 2000 MHz, a DisplayPort output alongside HDMI, dual 2.5 Gb Ethernet and Wi-Fi 6E, none of which the G3S can match with its single gigabit port and Wi-Fi 5. The NucBox G3S still has a case to make: it costs less, weighs a light 260 grams, and keeps the same one-year warranty and identical owner ratings as its bigger sibling. Both include a VESA mount and an HDMI cable in the box, and both run Windows 11 Pro out of it. Pick the GMKtec NucBox M5 Ultra (32GB + 512GB) for real multitasking headroom, extra storage or a home-networking box with dual 2.5 Gb ports; pick the GMKtec NucBox G3S (8GB + 256GB) for the cheapest possible way into the GMKtec lineup.
vs
Winner
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$559.99
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The biggest differences
Where these two are furthest apart, and by how much.
- Memory Capacity4×GMKtec NucBox M5 Ultra (32GB + 512GB)32 GB vs 8 GB
- Storage Capacity2×GMKtec NucBox M5 Ultra (32GB + 512GB)512 GB vs 256 GB
| Feature | GMKtec NucBox G3S (8GB + 256GB) | GMKtec NucBox M5 Ultra (32GB + 512GB) | Winner |
|---|---|---|---|
| Price | $249.99 | $419.99 | GMKtec NucBox G3S (8GB + 256GB) |
| Rating | 4.2 | 4.4 | GMKtec NucBox M5 Ultra (32GB + 512GB) |
| Memory Capacity | 8 GB | 32 GB | GMKtec NucBox M5 Ultra (32GB + 512GB) |
| GPU Model | Intel UHD Graphics (up to 1200 MHz) | AMD Radeon Graphics (8 cores, up to 2000 MHz) | GMKtec NucBox M5 Ultra (32GB + 512GB) |
| Storage Capacity | 256 GB | 512 GB | GMKtec NucBox M5 Ultra (32GB + 512GB) |
| CPU Model | Intel Processor N95 | AMD Ryzen 7 7730U | Different strengths |
| Memory Configuration | Single-channel | Dual-channel | Different strengths |
| Warranty | 1 year | 1 year | Tie |
| Memory Type | DDR4 | DDR4 | Tie |
29% OFF
$249.99
$349.99
- + Price: $249.99
- - Rating: 4.2 vs 4.4
- - Memory Capacity: 8 GB vs 32 GB
Winner
25% OFF
Prime exclusive deal$419.99
$559.99
- + Rating: 4.4
- + Memory Capacity: 32 GB
- + GPU Model: AMD Radeon Graphics (8 cores, up to 2000 MHz)
- - Price: $419.99 vs $249.99
Frequently Asked Questions
Which is better overall: GMKtec NucBox G3S (8GB + 256GB) or GMKtec NucBox M5 Ultra (32GB + 512GB)?
The GMKtec NucBox M5 Ultra (32GB + 512GB) wins overall, with four times the memory, double the storage and a full eight-core Ryzen 7 processor against the entry-level N95 chip in the GMKtec NucBox G3S (8GB + 256GB). The G3S remains the cheaper of the two.
What is the biggest difference between these two GMKtec mini PCs?
Memory and storage. The M5 Ultra ships with 32 GB of dual-channel DDR4 and a 512 GB SSD, while the G3S ships with 8 GB of single-channel DDR4 and a 256 GB SSD, a difference that shows up immediately in multitasking and how much software both can hold.
Does either have DisplayPort or dual networking?
The GMKtec NucBox M5 Ultra (32GB + 512GB) does, with a DisplayPort 1.4 output alongside HDMI and two 2.5 Gb Ethernet ports for dual-network setups. The GMKtec NucBox G3S (8GB + 256GB) has dual HDMI only and a single gigabit Ethernet port.
Are the warranty and accessories the same?
Yes. Both carry a one-year warranty and both include a VESA mount and an HDMI cable in the box, so the gap between them is entirely in the internal specifications, not in what ships with the unit.
Who should buy the GMKtec NucBox G3S (8GB + 256GB)?
Buyers who want the lowest-cost way into a small Windows desktop for browsing, office work or a media box, and do not need more than 8 GB of memory or 256 GB of storage.
Who should buy the GMKtec NucBox M5 Ultra (32GB + 512GB)?
Buyers who want a home-lab box, heavier multitasking or more storage headroom, thanks to its 32 GB of memory, 512 GB SSD and dual 2.5 Gb Ethernet ports for networking duty.
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