GMKtec NucBox K12 AMD Ryzen™ 7 H 255 Mini PC
- CPU & Graphics: AMD Ryzen™ 7 H 255 processor with 8 cores, 16 threads, boost speeds of up to 4.9 GHz and AMD Radeon™ 780M graphics
- Memory & Storage: 32 GB DDR5 dual-channel memory, upgradeable up to 96 GB, with 512 GB or 1 TB PCIe 4.0 SSD storage and support for up to 24 TB across 3 × M.2 slots
- Connectivity: 1 × HDMI 2.1, 1 × DisplayPort 1.4, 1 × USB4, 1 × USB-C with 4-display support, Wi-Fi 6, Bluetooth 5.2 and dual 2.5 Gigabit LAN
- Ideal For: Home office, multitasking, productivity and everyday desktop performance
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GMKtec Nucbox K12
AMD Ryzen™ 7 H 255
8 Cores / 16 Threads, Zen 4, 3.8GHz (Max. 4.9GHz), 8MB L2 + 16MB L3 cache, TDP 35–54W (Max. 70W Design)
AMD Radeon™ 780M, 12 Core @ 2600 MHz
Storage up to 24TB
512GB / 1TB SSD (PCIe 4.0), expandable up to 24TB via 3×M.2 (2×PCIe 4.0x2, 1×PCIe 4.0x4)
Dual-Channel DDR5 @5600 MT/s
32GB (2×16GB) @ 5600 MT/s, Max. 96GB
4 Screens 8K Display
1× HDMI 2.1, 1× DP 1.4, 1× USB4, 1× Type-C (supports simultaneous 4-screen output)
Oculink Port
PCle Gen4 x4,Supports external RTX 4060 GPU
WIFi 6E+BT5.2
WiFi 6E (RZ616), up to 2.4 Gbit/s at 160MHz
USB4.0 *1
AMD Ryzen™ 7 H 255
8 Cores / 16 Threads, Zen 4, 3.8GHz (Max. 4.9GHz), 8MB L2 + 16MB L3 cache, TDP 35–54W (Max. 70W Design)
AMD Radeon™ 780M, 12 Core @ 2600 MHz
Storage up to 24TB
512GB / 1TB SSD (PCIe 4.0), expandable up to 24TB via 3×M.2 (2×PCIe 4.0x2, 1×PCIe 4.0x4)
Dual-Channel DDR5 @5600 MT/s
32GB (2×16GB) @ 5600 MT/s, Max. 96GB
4 Screens 8K Display
1× HDMI 2.1, 1× DP 1.4, 1× USB4, 1× Type-C (supports simultaneous 4-screen output)
Oculink Port
PCle Gen4 x4,Supports external RTX 4060 GPU
WIFi 6E+BT5.2
WiFi 6E (RZ616), up to 2.4 Gbit/s at 160MHz
USB4.0 *1
Powerful core, new world of gaming
AMD Ryzen™ 7 H 255
Zen 4, 3.8GHz (Max. 4.9GHz)
8 Cores / 16 Threads, TDP 35–54W (Max. 70W Design)
8MB L2 + 16MB L3 Cache
Cinebench R23 Multi-Core Score
AMD Ryzen™ 7 H 255
Intel Core i5-13500H
AMD Ryzen 7 7735HS
Maximum Storage & Speed
With 128 GB DDR5 5600 MT/s (expandable up to 128 GB) and a 1 TB PCIe 4.0 SSD (supports up to 24 TB), the system offers enormous performance. Thanks to 2 × M.2 PCIe 4.0 x2 and 1 × M.2 PCIe 4.0 x4 slots, fast upgrades are possible at any time.
128GB (64GBx2) DDR5 5600MT/S Removable memory, supports up to 128GB
1TB PCle 4.0 SSD(Up to 24TB supported)
2*M.2 2280 PCIE4.0x2 SSD
1*M.2 2280 PCIE4.0x4 SSD
Gaming-ready network configuration
Wi-Fi 6E – up to 3× faster than Wi-Fi 5
Wi-Fi 6E outperforms Wi-Fi 6 with the new 6GHz band, support for up to 320MHz channels, delivering faster, more stable data speeds while staying compatible with Wi-Fi 6/5 devices.
WiFi 6E
Wifi 5
Dual LAN (RJ45) – Network connections, compatible with Linux, Ubuntu, ESXi and VMware
DUAL 2.5G HIGH SPEED ETHERNET
Read/Write Speed
2.5Gbps LAN
1000MbpS LAN
Specification
General
Zen 4 Architecture
Base Frequency 3.8GHz, Max Boost up to 4.9GHz
8MB L2 Cache / 16MB L3 Cache
12 Cores, up to 2600MHz
Dual-Channel 32GB (16GB × 2) standard configuration
DDR5-5600 Memory
Supports up to 96GB
1 × PCIe 4.0 ×4 slot + 2 × PCIe 4.0 ×2 slots
Supports up to 24TB total storage
Supports simultaneous multi-display output
Bluetooth 5.2
Dual 2.5G Ethernet LAN (Realtek 8125BG)
DC Power Adapter 19V / 6.32A, 120W
USB-C: 1 × USB 3.2 Gen2 Type-C (PD / DP / Data)
USB-A: 2 × USB 3.2 Gen2
USB-A: 1 × USB 2.0
Power Button: 1 × Power Button with White LED Indicator
Reset: 1 × Clear CMOS Button
USB4: 1 × USB4.0 Full-Function Port
HDMI: 1 × Standard HDMI 2.1
DisplayPort: 1 × DP 1.4 (DP++)
OCulink: 1 × PCIe Gen4 ×4 OCulink Port
USB-A: 1 × USB 3.2 Gen2 + 1 × USB 2.0
LAN: 2 × RJ45 2.5G Ethernet
Power: 1 × DC IN (5.5 × 2.5mm)
Supports lighting on/off control and multiple RGB lighting modes
Please connect or disconnect the cable only when the device is powered off.
Warranty Card
Power Adapter
HDMI Cable
VESA Mount Bracket
Frequently Asked Questions
A: Yes. We currently ship across the United Kingdom, mainly to mainland UK addresses. Some remote or special regions may require additional review.
A: Orders placed on our UK store are currently shipped from our warehouse and fulfilment partners in mainland China.
A: Orders are usually processed within 1–2 business days, and standard delivery to the UK typically takes around 7–14 business days.
A: Yes. We currently offer free standard shipping unless otherwise stated on the product page or at checkout.
A: In some cases, customs or courier clearance charges may be requested by the carrier or customs authority before delivery, depending on the shipping route and customs process.
A: Please follow the carrier’s instructions to complete the clearance process promptly and avoid delivery delays or parcel return. Keep your payment proof and the customs or courier receipt, then contact our support team with your order number and relevant documents. Eligible cases will be reviewed and handled accordingly.
A: If you purchase from our UK store as a consumer, you have the right to cancel your order within 7 days of receiving the goods. For change-of-mind returns, the customer is generally responsible for return shipping unless otherwise agreed.
For returns and refunds requested for reasons other than a product fault, including change-of-mind returns, a 15% repackaging / restocking fee will be deducted from the refund, regardless of whether the item has been opened or used.
A: Yes. GMKtec provides a 1-year limited warranty to the original purchaser from the date of order placement.
Reviews
It was a complete disaster!!!
It took more than 3 weeks to reach my order. The PC I got is faulty. It couldnt able to open once. I tried to contact after sales team, I got reply after 2 days and they said its a defective item with issues in motherboard.
The next thing they asked me to send the device back for replacement with long guidelines. The interesting part they asked me to pay the shipping fees. I also paid the custom duty asked my their courier. All of this for nothing. Even their policy says, customer pays the shipping fees if they change their mind. So sending defective PC, wasting so much time and putting me in hassle for sending is actually change of the mind.
Looks like a complete scam.
When I said them, now I have to wait for this parcel to reach you then it takes ages to send me back. They said if you want urgent one, you can place another order, they can give you a mighty discount of £15.
I dont know if someone senior reading from this company, take some action please.
Terrible experience.
just what i asked for
I just set it up!!! Tested a bit, and i can tell- its a proper beast....today will test some games...thx for NucBox k12... I dont know how in this small box can be so much power... Thank you
Excellent mini pc with a very small footprint. Very powerful pc much more than I need for my needs. It boosts up in seconds and launches all the apps at great speed. Has all the connections to add all the peripherals.
Had a few teething troubles with windows not loading [after a windows update] but after making a clean install of windows it works fine. Apart from that, the machine itself is very nice and lives up to expectations.
Great little machine - very powerful and have several docker containers happily running 24x7 - would defiantly buy again and a good overall experience with GMKtec.
Delivery was fast and everything was great. The PC itself is pleasantly quiet and has plenty of performance. I am really impressed with it. I would buy it again anytime, and Battlefield runs absolutely smoothly on this little machine.
So far, so good. It does what it says it would, and my early experience with it has been positive.
It is a nice little box, about 6 by 6 by 3 inches, and it fits nicely on the shelf. It feels fast in use and leaves a strong first impression.
It was very well packaged, easy for me to set up, and so far it has met my expectations. Time will tell, but my first impression is very good.
I bought this mini PC as a compact gaming platform and after some research I settled on this one. It feels well made, attractive, capable, and reliable. I wiped Windows and installed Bazzite Linux, and everything worked properly for me, including Wi‑Fi, audio, video, USB, Bluetooth, and power control. I installed Skyrim and Baldur's Gate 3 through Steam and both performed flawlessly on this little box. My only complaint is that the Bluetooth was a bit weak with the metal case, but adding a small ASUS USB Bluetooth adapter solved the range and audio stutter issues.
I use this device as a home server, so the generous RAM configuration matters a lot to me. I was also able to fit two more NVMe drives into the system because it has three slots. The OCuLink interface is a real highlight. In my setup, it works with a reflashed HBA card that provides 8 SATA ports, and my two ZFS filesystems have been extremely stable and fast. Overall, I think this is a great device and almost too good to hide away in a basement.
I connected an eGPU to it and the box has been running stably for me. I would buy it again. The internal SSD was small and from a no-name brand, but I replaced it with a larger one, and I still have not exhausted all of the upgrade options yet.
I ordered this PC and returned it immediately without really testing it because I noticed that two of the three possible SSD slots only run on two lanes each, which effectively cuts the speed. I probably could have checked that earlier, so part of that is on me. Aside from that, I think the overall feature set is very good for the price, especially if I compare it with much more expensive systems.
