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Gaming PC · Ofgem 1 July to 30 September 2026

Ultra PC (RTX 4090) electricity cost — Weekend marathon — 8 hours on two days

Weekend-warrior: 8-hour gaming sessions on Saturday and Sunday. A <strong>Ultra PC (RTX 4090)</strong> draws 675 W total (GPU 450 W + rest of system 225 W). Cost: £2.82/week at Ofgem cap 26.11p/kWh (1 July to 30 September 2026).

Ultra PC (RTX 4090) — Weekend marathon — 8 hours on two days: 0.675 kW × 8 h = 5.400 kWh = £1.41/session. Weekly (2 sessions): £2.82. Monthly: £12.22. Annual: £146.63. Source: Nvidia / AMD / Intel — published TDP specifications for GPU and CPU components + Ofgem (OGL v3.0).

Per session
£1.41
Per week (2 sessions)
£2.82
Per month
£12.22
Per year
£146.63

Rig specification

Tier
ultra
GPU
Nvidia GeForce RTX 4090
GPU TDP
450 W
Rest of system
225 W
Total system
675 W
Sessions/week
2

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 × 8 h = 5.400 kWh × 26.11p = £1.41.
  3. Weekly: £1.41 × 2 sessions = £2.82.
  4. Monthly: £2.82 × 52 ÷ 12 = £12.22.
  5. Annual: £2.82 × 52 = £146.63.

Same scenario — other gaming rigs

Budget PC (GTX 1660 Super): £1.02/wkMid-range PC (RTX 3070): £1.46/wkHigh-end PC (RTX 4070): £1.48/wkAMD Ultra PC (RX 7900 XTX): £2.32/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.