Specs & Power Consumption: Qotom Q20321G9

Estimated data Intel Atom C3558R

Qotom Q20321G9 (Atom C3558R): estimated 20W idle and 64W under load, 4x 10G SFP+ + 5x 2.5GbE, up to 64 GB RAM. No VESA: alternative mounting tips.

Technical specifications

Brand	Qotom
Model	Q20321G9
CPU	Intel Atom C3558R
Max RAM	64 GB estimate
Network ports	4x 10G SFP+ + 5x 2.5GbE estimate
Dimensions	230 × 170 × 44 mm estimate
VESA mount	No estimate

Power consumption & electricity cost

Idle estimate20 W

Under load estimate64 W

Estimated 24/7 average28.8 W

Yearly cost (€0.25/kWh)63.07 €

Average based on 80% of the time at idle and 20% under load, running 24/7: 252 kWh/year. Adjust the inputs to match your usage:

Energy: 252 kWh/year · Cost: 63.07 €/year (5.26 €/month)

Mounting & usage guide

Mounting

Footprint 230 × 170 mm, 44 mm tall (about 1.72 litres).
No VESA mount: place it on a shelf or a rack tray, or use a universal strap-style mini PC holder.

Cooling & heat

Fanless aluminium case: the chassis is the heatsink and can feel hot to the touch in continuous use, which is normal.
Avoid closed cabinets without airflow; when lying flat, leave a few cm above the fins.
Under load it reaches about 64 W and the fan becomes audible. For an always-on server, lower the power limit (TDP) in the BIOS to cut heat and noise.
Clean dust from the vents every 6-12 months to keep temperatures and power draw low.

Recommended use cases

OPNsense or pfSense firewall/router: 4x 10G SFP+ + 5x 2.5GbE to split WAN, LAN and VLANs.
Proxmox VE with several VMs and LXC containers: up to 64 GB RAM.
Home lab with fast network storage: the 10G ports suit NAS, backups and Proxmox clusters.

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Data sources

Every value on this page is an estimate: the page is not indexed until at least one value has a source.

Estimated from the CPU class and measurements of similar models: idle power, load power, dimensions, VESA support, max RAM, network ports. Always check the manufacturer's spec sheet.

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