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Compact gunmetal black mini PC with RGB lighting

GMKtec

GMKtec K12 barebone mini PC Ryzen 7 H 255 32GB DDR5 512GB

SKU CH-JD0D-J3EFJ MPN K12

Compact barebone mini PC with a Ryzen 7 H 255 processor, 32 GB DDR5 memory, 512 GB storage and triple M.2 expansion up to 24 TB

  • ProcessorAMD Ryzen 7
  • Form factorMINI PC
  • Wi-Fi standardWi-Fi 6E
  • Processor socketTSMC 4 nm FinFET
  • Processor cores8-Core
  • ChipsetIntegrated in AMD Ryzen 7 H 255 SoC
  • 8-core Ryzen 7 H 255 reaches 4.9 GHz for fast multitasking
  • Radeon 780M integrated graphics drives 8K output and FSR gaming
  • 32 GB DDR5 5600 MT/s dual-channel memory handles heavy workloads
  • Three M.2 2280 PCIe 4.0 slots support up to 24 TB total storage
  • Dual 2.5 GbE LAN plus WiFi 6E and BT 5.2 give flexible connectivity

Compact barebone for gaming and creative work

The GMKtec K12 barebone mini PC arrives with a Ryzen 7 H 255 processor, 32GB of DDR5 5600 MT/s memory and a 512GB PCIe 4.0 NVMe SSD. Integrated Radeon 780M graphics drive up to four displays at 8K resolution. An Oculink port enables external GPU expansion, while dual 2.5GbE LAN and WiFi 6E handle networking.

Who this suits and who should look elsewhere

Buyers wanting a small, quiet system for 1080p or 1440p gaming, content creation or multi-monitor productivity will appreciate the pre-installed Windows 11 Pro and 35dB cooling. The 120W power adapter and VC thermal design support sustained loads. Users needing more than 32GB of RAM, discrete graphics performance without an eGPU, or storage beyond 24TB across the three M.2 slots should consider other platforms.

Three M.2 2280 slots with 24TB total capacity

Storage expansion is the decisive specification: three PCIe 4.0 M.2 2280 slots accept up to 24TB combined, with one slot wired for x4 and two for x2 bandwidth. The included 512GB drive occupies one slot, leaving two open for additional NVMe SSDs. This density lets the mini PC serve as a compact workstation or media server without external enclosures.

How it compares

Measured against everything we stock in Mini PC Barebone Systems, at today’s prices. Recalculated every night.

Price $535.99
Typical for this category: the median of 1,735 items is $564.99.

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Specifications

Product
Brand nameGMKtec
Product lineK12
Model nameK12 32+512
Part numberK12 32+512
Product colorGunmetal Black
Processor
ProcessorAMD Ryzen 7
Processor socketTSMC 4 nm FinFET
Processor cores8-Core
ChipsetIntegrated in AMD Ryzen 7 H 255 SoC
Memory
Installed memory32 GB (2 × 16 GB) DDR5 5600 MT/s
RAM slots2 x SO-DIMM Slots
Supported memoryDDR5 5600 MT/s
Dual-channel supportYes
Storage
Installed storage512 GB PCIe 4.0 M.2 2280 NVMe SSD
M.2 slots3x M.2 2280 PCIe 4.0 Slots (Max 24 TB Total Storage)
Graphics
Built-in graphicsAMD Radeo 780M
Audio & video
Built-in audioRealtek HD Audio Codec
Channel countStereo (2-channel)
Connectivity
LAN connectionDual 2.5GbE Ethernet (Realtek RTL8125BG)
Maximum network speed2.5 Gbit/s per port
Wi-Fi standardWiFi 6E (RZ616, up to 2.4 Gbit/s)
Bluetooth support5.2
Ports & slots
Front USB ports3 Ports (1x USB3.2 Gen2 Type-C, 2x USB3.2 Gen2 Type-A, 1x USB2.0 Type-A)
Front audio jacks1 × 3.5 mm Combo Audio Jack
Other front ports1x Power Button, 1x Reset Button (Clear CMOS)
HDMI portsStandard HDMI 2.1 (Supports 8K@120 Hz)
DisplayPort connectorsDP 1.4 (Supports 8K@120 Hz)
Rear USB portsTotal: 5 Ports (1x USB4, 1x USB3.2 Gen2, 2x USB3.2 Gen1, 1x USB2.0)
Ethernet portDual 2.5GbE Ethernet (Realtek RTL8125BG)
Rear audio jacks1 × 3.5 mm Combo Audio Jack
Additional rear ports1 x OCulink (PCIe 4.0 x4)
Internal connectors2 x M.2 2280 PCIe 4.0 Slots (1x for SSD, 1x for SSD/Extension)
Input100-240 V AC, 50/60 Hz (Universal Input)
Power
Power supply120 W DC Output (19 V 6.32A)
Size & build
Form factorMINI PC
Product dimensions15.4 × 15.1 × 7.36 cm
Product weight0.92kg
More details
South bridgeIntegrated in AMD Ryzen 7 H 255 SoC
Additional details3x M.2 2280 PCIe 4.0 Slots (Max 24 TB Total Storage)

Questions about this item

How do I install extra M.2 2280 SSDs in the three PCIe 4.0 slots?

Open the chassis, insert each drive at an angle into the M.2 2280 slot, secure with the screw, and close the case; the step often missed is tightening the screw so the drive makes full contact with the thermal pad.

What maintenance will the dual-fan VC cooling system need later?

Blow dust from the fan intakes and heatsink fins every few months; the thermal pads on the DDR5 and SSD areas should be checked when drives are swapped.

At what temperature does the Ryzen 7 H 255 hit its thermal limit under sustained load?

The CPU TDP scales up to 70 W and the cooling is rated to 35 dB; sustained heavy workloads will push the SoC toward its 100 °C junction limit before throttling begins.

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