Updated September 2026
Data from Amazon and official GMKtec site.
2026 verdict
More memory, more graphics headroom and typically a higher price: the GMKtec NucBox M5 Ultra (32GB + 512GB) is the stronger mini PC in this GMKtec-on-GMKtec matchup, running its DDR4 at a faster 3200 MT/s, doubling the installed capacity to 32 GB, and pairing its Ryzen chip with a Radeon iGPU that clocks up to 2000 MHz across 8 graphics cores, well past the 1000 MHz Intel UHD Graphics fitted to the GMKtec NucBox G3 Pro (16GB + 512GB). The G3 Pro answers back with a lower price and a slightly higher owner rating, plus a second M.2 bay split between a 2280 PCIe slot and a 2242 SATA slot that leaves room to add storage without touching the drive already installed. Both machines top out at 64 GB of memory, start with a 512 GB SSD, pair Wi-Fi with Bluetooth 5.2, include a VESA mount and HDMI cable in the box, and carry the same 1 year warranty, and neither offers Thunderbolt, an SD card slot or a fingerprint reader. Buyers building a homelab node, a virtualization host or anything that leans on memory bandwidth and graphics power should choose the GMKtec NucBox M5 Ultra (32GB + 512GB); those who just want a light office or media desktop at a lower entry price should pick the GMKtec NucBox G3 Pro (16GB + 512GB).
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| Feature | GMKtec NucBox G3 Pro (16GB + 512GB) | GMKtec NucBox M5 Ultra (32GB + 512GB) | Winner |
|---|---|---|---|
| Price | $319.59 | $559.99 | GMKtec NucBox G3 Pro (16GB + 512GB) |
| Rating | 4.4 | 4.3 | GMKtec NucBox G3 Pro (16GB + 512GB) |
| Memory Speed | 2666 MHz | 3200 MT/s | GMKtec NucBox M5 Ultra (32GB + 512GB) |
| Memory Capacity | 16 GB | 32 GB | GMKtec NucBox M5 Ultra (32GB + 512GB) |
| GPU Model | Intel UHD Graphics (up to 1000 MHz) | AMD Radeon Graphics (8 cores, up to 2000 MHz) | GMKtec NucBox M5 Ultra (32GB + 512GB) |
| CPU Model | Intel Core i3-10110U | AMD Ryzen 7 7730U | Different strengths |
| Warranty | 1 year | 1 year | Tie |
| Memory Configuration | Dual-channel | Dual-channel | Tie |
| Memory Type | DDR4 | DDR4 | Tie |
| Storage Capacity | 512 GB | 512 GB | Tie |
31% OFF
$319.59
$459.99
- + Price: $319.59
- + Rating: 4.4
- - Memory Speed: 2666 MHz vs 3200 MT/s
- - Memory Capacity: 16 GB vs 32 GB
Winner
$559.99
- + Memory Speed: 3200 MT/s
- + Memory Capacity: 32 GB
- + GPU Model: AMD Radeon Graphics (8 cores, up to 2000 MHz)
- - Price: $559.99 vs $319.59
- - Rating: 4.3 vs 4.4
Frequently Asked Questions
Which is better overall: GMKtec NucBox G3 Pro (16GB + 512GB) or GMKtec NucBox M5 Ultra (32GB + 512GB)?
The GMKtec NucBox M5 Ultra (32GB + 512GB), which pairs faster 3200 MT/s memory with double the installed capacity and a stronger Radeon iGPU. The GMKtec NucBox G3 Pro (16GB + 512GB) wins on price and owner rating, so it stays the better pick for lighter workloads on a tighter budget.
What is the biggest difference between the GMKtec NucBox G3 Pro (16GB + 512GB) and the GMKtec NucBox M5 Ultra (32GB + 512GB)?
The processor platform. The GMKtec NucBox M5 Ultra (32GB + 512GB) runs an AMD Ryzen chip with Radeon graphics clocked up to 2000 MHz across 8 cores, while the GMKtec NucBox G3 Pro (16GB + 512GB) uses an Intel Core i3-10110U paired with Intel UHD Graphics topping out at 1000 MHz.
Which one has more memory, and can it be upgraded?
The GMKtec NucBox M5 Ultra (32GB + 512GB) ships with 32 GB installed against 16 GB on the GMKtec NucBox G3 Pro (16GB + 512GB), but both use dual DDR4 SO-DIMM slots with the same 64 GB ceiling, so the G3 Pro can be upgraded to match later.
Which mini PC has the better display output?
The GMKtec NucBox M5 Ultra (32GB + 512GB) pairs an HDMI 2.0 port with a DisplayPort 1.4 output rated up to 8K at 60 Hz. The GMKtec NucBox G3 Pro (16GB + 512GB) relies on two HDMI 1.4 ports instead, which cap a dual 4K setup at 24 Hz and skip DisplayPort entirely.
Who should buy the GMKtec NucBox M5 Ultra (32GB + 512GB)?
Buyers setting up a homelab node, a virtualization host or any workload that benefits from more memory bandwidth and stronger integrated graphics, and who don't mind paying more for it.
Who should buy the GMKtec NucBox G3 Pro (16GB + 512GB)?
Buyers who want a lighter office or media desktop at a lower entry price, plus the flexibility of a second M.2 bay (one PCIe, one SATA) to add storage without replacing the drive already installed.
Full comparison table
Compare all 65 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.
- 65 Mini PCs
- 41 specs compared
- 38 filters
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BeelinkSER8 (32GB + 1TB)
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BeelinkSER9 Pro (24GB + 1TB)
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AppleMac Mini (M4 16GB + 512GB)
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AppleMac Mini (M4 Pro 24GB + 512GB)
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AppleMac Mini (M2 Pro 16GB + 512GB)
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BeelinkSER5 Pro (16GB + 480GB)
$389.00
GMKtecNucBox M7 Ultra (32GB + 512GB)
$599.99
GeekomGT1 Mega Ultra 9
10% OFF$949.00$854.10
BeelinkMini S12 (N95 8GB + 480GB)
$289.00
BeelinkEQi 304 (24GB + 512GB)
$629.00
GeekomA9 Mega (128GB + 2TB)
5% OFF$3999.00$3799.04- GMKtec
NucBox G3 Pro (16GB + 512GB)
31% OFF$459.99$319.59 
GMKtecNucBox M2 Pro S (16GB + 1TB)
$499.98
Mini PCsGMKtecG10 (16GB + 512GB)
4.1(293)$319.99- Mini PCsGMKtec
NucBox G3 Pro (16GB + 512GB)
4.4(1,668)31% OFF$459.99$319.59 
Mini PCsGMKtecNucBox G3S (8GB + 256GB)
4.2(1,820)$249.99- Mini PCsGMKtec
NucBox M2 Pro S (16GB + 1TB)
4.4(749)$499.98 
Mini PCsGMKtecNucBox M5 Ultra (32GB + 512GB)
4.3(985)$559.99
Mini PCsGMKtecNucBox M6 Ultra (32GB + 1TB)
4.2(476)$629.99- Mini PCsGMKtec
NucBox M7 Ultra (32GB + 512GB)
4.5(1,018)$599.99