GMKtec K12 Mini PC AMD Ryzen TM 7 H 255
The GMKtec K12 is a compact mini PC powered by an AMD Ryzen 7 H 255 processor with 8 cores and Radeon 780M graphics. It comes with 32GB of DDR5 RAM, a 1TB SSD, and three M.2 PCIe 4.0 slots for expansion. It supports quad displays via HDMI 2.1, DisplayPort, USB4, and USB-C, plus dual 2.5G Ethernet, Wi-Fi 6E, and an OCuLink port for external GPUs.
Full Specifications
| Model | GMKtec NUCBOX K12 |
| Processor | AMD Ryzen TM 200 Series Processor, 8 Cores, 16 Threads Zen 4 Architecture Base Frequency 3.8GHz, Max Boost up to 4.9GHz 8MB L2 Cache / 16MB L3 Cache |
| Processor Model | AMD Ryzen TM 7 H 255 |
| Processor Package | TSMC 4nm FinFET |
| Graphics | AMD Radeon TM 780M Graphics 12 Cores, up to 2600MHz |
| Display Support | Quad display output via HDMI 2.1 + DisplayPort 1.4 + USB4 + USB Type-C Supports simultaneous multi-display output |
| Memory | 2 x DDR5 SO-DIMM Slots Dual-Channel 32GB (16GB x 2) standard configuration DDR5-5600 Memory Supports up to 96GB |
| Storage | 512GB / 1TB SSD options |
| Storage Expansion | 3 x M.2 2280 PCIe 4.0 SSD Slots 1 x PCIe 4.0 x4 slot + 2 x PCIe 4.0 x2 slots Supports up to 24TB total storage |
| Front I/O | Audio: 1 x 3.5mm Combo Jack USB-C: 1 x USB 3.2 Gen2 Type-C (PD / DP / Data) USB-A: 2 x USB 3.2 Gen2 USB-A: 1 x USB 2.0 Power Button: 1 x Power Button with White LED Indicator Reset: 1 x Clear CMOS Button |
| Rear I/O | Audio: 1 x 3.5mm Combo Jack USB4: 1 x USB4.0 Full-Function Port HDMI: 1 x Standard HDMI 2.1 DisplayPort: 1 x DP 1.4 (DP++) OCulink: 1 x PCIe Gen4 x4 OCulink Port USB-A: 1 x USB 3.2 Gen2 + 1 x USB 2.0 LAN: 2 x RJ45 2.5G Ethernet Power: 1 x DC IN (5.5 x 2.5mm) |
| Network | Wi-Fi 6E (RZ616, up to 2.4Gbps) Bluetooth 5.2 Dual 2.5G Ethernet LAN (Realtek 8125BG) |
| Operating System | Windows 11 Pro |
| Operating System Options | US, EU, UK, AU |
| Power | Built-in coin cell battery DC Power Adapter 19V / 6.32A, 120W |
| Power Options | US, EU, UK, AU |
| Dimensions | 154 x 151 x 73.6 mm |
| Weight | Approx. 920 g |
| Color | Iron Gray |
| Environmental | 0C - 40C |
| Certifications | CCC, CE, FCC, RoHS, MIC, CEC, China Energy Label, UL Report |
| Package Contents | User Manual Warranty Card Power Adapter HDMI Cable VESA Mount Bracket |
| Features | 1 x System Fan Control Button Supports lighting on/off control and multiple RGB lighting modes | The OCulink port does not support hot-plugging. Please connect or disconnect the cable only when the device is powered off. | OCulink Port | 3x M.2 2280 PCIe 4.0 | 2x 2.5G LAN + Wi-Fi 6E + BT 5.2 |
| Overview | GMKtec K12 Mini PC. Powered by AMD Ryzen 7 H 255! Co-created with Red Dot Award Winner Crafted with Passion. GMKtec Gaming Mini PC AMD Ryzen 7 H 255 (Upgraded 8745HS) 32GB DDR5 1TB SSD, Desktop Computer 3XM.2 2280 Expansion, Oculink, Dual NIC 2.5G, HDMI 2.1, USB4 K12 |
| Warranty | 1-Year Limited Warranty |
| Configurations | Barebone (No DDR & SSD & OS) | 32GB RAM + 1TB SSD | 64GB RAM + 1TB SSD |
| languageSupport | 14 Languages Supported (Default English): Simplified Chinese, Traditional Chinese, French, Dutch, Italian, Spanish, Korean, Japanese, German, Hebrew, Russian, Portuguese, Arabic |
Compare with other GMKtec devices
Comments
Bought the K12 for my home office and light gaming. The Ryzen 7 and Radeon 780M handle everything I throw at it—even some AAA titles at 1080p. Three M.2 slots and OCuLink for future upgrades are huge bonuses. Dual 2.5G LAN and Wi-Fi 6E are overkill for me but nice. Runs cool and quiet. Only gripe: no included RAM/storage option is weird. Overall, a solid little powerhouse for $360 barebones.
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