Ultra PC (RTX 4090) electricity cost — Regular — 2 hours per session
Regular gaming habit: 2 hours most evenings, 5 days a week. A <strong>Ultra PC (RTX 4090)</strong> draws 675 W total (GPU 450 W + rest of system 225 W). Cost: £1.76/week at Ofgem cap 26.11p/kWh (1 July to 30 September 2026).
Ultra PC (RTX 4090) — Regular — 2 hours per session: 0.675 kW × 2 h = 1.350 kWh = 35.2p/session. Weekly (5 sessions): £1.76. Monthly: £7.64. Annual: £91.65. Source: Nvidia / AMD / Intel — published TDP specifications for GPU and CPU components + Ofgem (OGL v3.0).
- Per session
- 35.2p
- Per week (5 sessions)
- £1.76
- Per month
- £7.64
- Per year
- £91.65
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 × 2 h = 1.350 kWh × 26.11p = 35.2p.
- Weekly: 35.2p × 5 sessions = £1.76.
- Monthly: £1.76 × 52 ÷ 12 = £7.64.
- Annual: £1.76 × 52 = £91.65.
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.