Ultra PC (RTX 4090) electricity cost — 2 hours gaming + 6 h idle standby
PC is on for 8 hours (2 h active gaming + 6 h idle/video/browsing) on 5 days. Idle system draw estimated at 80 W. A <strong>Ultra PC (RTX 4090)</strong> draws 675 W total (GPU 450 W + rest of system 225 W). Cost: £2.39/week at Ofgem cap 26.11p/kWh (1 July to 30 September 2026).
Ultra PC (RTX 4090) — 2 hours gaming + 6 h idle standby: 0.675 kW × 2 h active = 1.350 kWh + 0.08 kW × 6 h idle = 0.480 kWh. Session total: 1.830 kWh = 47.8p. Weekly (5 sessions): £2.39. Monthly: £10.35. Annual: £124.23. Source: Nvidia / AMD / Intel — published TDP specifications for GPU and CPU components + Ofgem (OGL v3.0).
- Per session
- 47.8p
- Per week (5 sessions)
- £2.39
- Per month
- £10.35
- Per year
- £124.23
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
- Active gaming (2 h): 675 W ÷ 1000 × 2 h = 1.350 kWh × 26.11p = 35.2p.
- Idle (6 h): 80 W ÷ 1000 × 6 h = 0.480 kWh × 26.11p = 12.5p.
- Per session total: 1.830 kWh = 47.8p.
- Weekly: 47.8p × 5 days = £2.39.
- Annual: £2.39 × 52 = £124.23.
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.