Ultra PC (RTX 4090) electricity cost — Casual — 1 hour per session
Light casual gaming: one hour a session, three times a week. A <strong>Ultra PC (RTX 4090)</strong> draws 675 W total (GPU 450 W + rest of system 225 W). Cost: 52.9p/week at Ofgem cap 26.11p/kWh (1 July to 30 September 2026).
Ultra PC (RTX 4090) — Casual — 1 hour per session: 0.675 kW × 1 h = 0.675 kWh = 17.6p/session. Weekly (3 sessions): 52.9p. Monthly: £2.29. Annual: £27.49. Source: Nvidia / AMD / Intel — published TDP specifications for GPU and CPU components + Ofgem (OGL v3.0).
- Per session
- 17.6p
- Per week (3 sessions)
- 52.9p
- Per month
- £2.29
- Per year
- £27.49
Rig specification
- Tier
- ultra
- GPU
- Nvidia GeForce RTX 4090
- GPU TDP
- 450 W
- Rest of system
- 225 W
- Total system
- 675 W
- Sessions/week
- 3
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 × 3 sessions = 52.9p.
- Monthly: 52.9p × 52 ÷ 12 = £2.29.
- Annual: 52.9p × 52 = £27.49.
Same scenario — other gaming rigs
Track gaming PC running costs
Updated each time the Ofgem cap changes.
No spam. Unsubscribe anytime. A Gera Services product.
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.