Ultra PC (RTX 4090) electricity cost — School-age — 1 h after school (weekdays)
Typical school-age child: 1 hour gaming after school on weekdays. A <strong>Ultra PC (RTX 4090)</strong> draws 675 W total (GPU 450 W + rest of system 225 W). Cost: 88.1p/week at Ofgem cap 26.11p/kWh (1 July to 30 September 2026).
Ultra PC (RTX 4090) — School-age — 1 h after school (weekdays): 0.675 kW × 1 h = 0.675 kWh = 17.6p/session. Weekly (5 sessions): 88.1p. Monthly: £3.82. Annual: £45.82. Source: Nvidia / AMD / Intel — published TDP specifications for GPU and CPU components + Ofgem (OGL v3.0).
- Per session
- 17.6p
- Per week (5 sessions)
- 88.1p
- Per month
- £3.82
- Per year
- £45.82
Rig specification
- Tier
- ultra
- GPU
- Nvidia GeForce RTX 4090
- GPU TDP
- 450 W
- Rest of system
- 225 W
- Total system
- 675 W
- Sessions/week
- 5
Nvidia RTX 4090 TDP 450 W (published Nvidia spec); rest of system ~225 W ultra build with i9-14900K (125 W TDP) + PSU/fans
How the cost is worked out
- System power: 450 W (GPU) + 225 W (CPU + rest) = 675 W total.
- Per session: 675 W ÷ 1000 × 1 h = 0.675 kWh × 26.11p = 17.6p.
- Weekly: 17.6p × 5 sessions = 88.1p.
- Monthly: 88.1p × 52 ÷ 12 = £3.82.
- Annual: 88.1p × 52 = £45.82.
Same scenario — other gaming rigs
Track gaming PC running costs
Updated each time the Ofgem cap changes.
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GPU TDP from Nvidia / AMD / Intel — published TDP specifications for GPU and CPU components. Unit rate 26.11p/kWh from Ofgem — Energy price cap unit rates and standing charges (1 July to 30 September 2026), OGL v3.0. Last updated: 2026-06-20.