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Gaming PC · Ofgem 1 July to 30 September 2026

Ultra PC (RTX 4090) electricity cost — Daily — 4 hours every day

Daily gaming at 4 hours a session — every day of the week. A <strong>Ultra PC (RTX 4090)</strong> draws 675 W total (GPU 450 W + rest of system 225 W). Cost: £4.93/week at Ofgem cap 26.11p/kWh (1 July to 30 September 2026).

Ultra PC (RTX 4090) — Daily — 4 hours every day: 0.675 kW × 4 h = 2.700 kWh = 70.5p/session. Weekly (7 sessions): £4.93. Monthly: £21.38. Annual: £256.61. Source: Nvidia / AMD / Intel — published TDP specifications for GPU and CPU components + Ofgem (OGL v3.0).

Per session
70.5p
Per week (7 sessions)
£4.93
Per month
£21.38
Per year
£256.61

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

  1. System power: 450 W (GPU) + 225 W (CPU + rest) = 675 W total.
  2. Per session: 675 W ÷ 1000 × 4 h = 2.700 kWh × 26.11p = 70.5p.
  3. Weekly: 70.5p × 7 sessions = £4.93.
  4. Monthly: £4.93 × 52 ÷ 12 = £21.38.
  5. Annual: £4.93 × 52 = £256.61.

Same scenario — other gaming rigs

Budget PC (GTX 1660 Super): £1.79/wkMid-range PC (RTX 3070): £2.56/wkHigh-end PC (RTX 4070): £2.60/wkAMD Ultra PC (RX 7900 XTX): £4.06/wk
See all 5 gaming rig costs

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.