Ultra PC (RTX 4090) electricity cost — Heavy — 6 hours per session
Heavy user or PC left on for long sessions, 6 hours a day. A <strong>Ultra PC (RTX 4090)</strong> draws 675 W total (GPU 450 W + rest of system 225 W). Cost: £7.40/week at Ofgem cap 26.11p/kWh (1 July to 30 September 2026).
Ultra PC (RTX 4090) — Heavy — 6 hours per session: 0.675 kW × 6 h = 4.050 kWh = £1.06/session. Weekly (7 sessions): £7.40. Monthly: £32.08. Annual: £384.91. Source: Nvidia / AMD / Intel — published TDP specifications for GPU and CPU components + Ofgem (OGL v3.0).
- Per session
- £1.06
- Per week (7 sessions)
- £7.40
- Per month
- £32.08
- Per year
- £384.91
Rig specification
- Tier
- ultra
- GPU
- Nvidia GeForce RTX 4090
- GPU TDP
- 450 W
- Rest of system
- 225 W
- Total system
- 675 W
- Sessions/week
- 7
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 × 6 h = 4.050 kWh × 26.11p = £1.06.
- Weekly: £1.06 × 7 sessions = £7.40.
- Monthly: £7.40 × 52 ÷ 12 = £32.08.
- Annual: £7.40 × 52 = £384.91.
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.