Specs & Power Consumption: GMKtec NucBox K9

Partially verified data Intel Core Ultra 5 125H

GMKtec NucBox K9 (Ultra 5 125H): 11W idle and 53W under load (measured), 2x 2.5GbE, up to 96 GB RAM. VESA mount behind your monitor.

Technical specifications

Idle [source]11 W

Under load [source]53 W

Estimated 24/7 average19.4 W

Yearly cost (€0.25/kWh)42.49 €

Average based on 80% of the time at idle and 20% under load, running 24/7: 170 kWh/year. Adjust the inputs to match your usage:

Energy: 170 kWh/year · Cost: 42.49 €/year (3.54 €/month)

Footprint 129 × 127 mm, 48 mm tall (about 0.79 litres).
Supports VESA mounting (75/100 mm bracket): attach it behind your monitor or under the desk to free up space. Keep the front USB ports and power button reachable.
When VESA-mounted, keep the vents clear: leave at least 1-2 cm between the case and the monitor.

Active cooling: nearly silent at idle, the fan is audible under sustained load.
Clean dust from the vents every 6-12 months to keep temperatures and power draw low.

See the current price and available configurations for GMKtec NucBox K9.

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Idle power: 11 W — notebookcheck.net (measured review, checked on 2026-11-06)
Load power: 53 W — notebookcheck.net (measured review, checked on 2026-11-06)
Dimensions: 129 × 127 × 48 mm — gmktec.com (official source, checked on 2026-11-06)

Unverified values*: VESA support, max RAM, network ports.

* Value not verified by a reliable source: collected with an AI assistant and not yet confirmed by an official spec sheet or a measurement.

Real-world power draw varies with OS, RAM, drives, peripherals and BIOS settings.