How much does an RTX 4090 cost to run?
About $7.40 a month for a whole RTX 4090 gaming PC used 4 hours a day (half gaming) with one monitor, at the US average rate of 18.16 ¢/kWh. Estimates, not measurements.
Monthly cost by location
4 h/day, 50% gaming, 1 monitor, typical 6-core CPU, 80 PLUS Gold PSU.
| Location | Rate | Per gaming hour | Per month | Per year |
|---|---|---|---|---|
| US average | 18.16¢ | $0.099 | $7.40 | $89 |
| Texas | 15.91¢ | $0.087 | $6.49 | $78 |
| California | 29.75¢ | $0.162 | $12.13 | $146 |
| New York | 28.65¢ | $0.156 | $11.68 | $140 |
| Florida | 14.99¢ | $0.082 | $6.11 | $73 |
| Nevada (cheapest state) | 12.72¢ | $0.069 | $5.19 | $62 |
| Hawaii (most expensive state) | 47.18¢ | $0.257 | $19.23 | $231 |
| United Kingdom (USD) | 40.50¢ | $0.220 | $16.51 | $198 |
| Germany (USD) | 40.90¢ | $0.222 | $16.67 | $200 |
| Canada (USD) | 12.30¢ | $0.067 | $5.01 | $60 |
| Australia (USD) | 25.90¢ | $0.141 | $10.56 | $127 |
Heavier use at the US average: 8 h/day, 75% gaming ≈ $19.38/month. Running at full load 24/7 (rendering, AI, mining) ≈ $88/month.
Test your own RTX 4090 PC (30 s)Watts for an RTX 4090 PC
| State | GPU only | Whole PC at the wall |
|---|---|---|
| Idle / desktop | ~32 W | ~81 W |
| Typical gaming | ~382 W | ~519 W |
| Full load | 450 W | ~667 W |
FAQ
How many watts does an RTX 4090 use?
NVIDIA/AMD/Intel rate the reference RTX 4090 at 450 W board power. In games it typically draws less than its rating; we model about 382 W gaming and 32 W at idle. Factory-overclocked cards can draw more.
How much does it cost to run an RTX 4090 PC per hour?
About $0.099 per gaming hour for the whole PC plus one monitor at the US average 18.16 ¢/kWh (August 2026, EIA). That is an estimate with a typical 6-core CPU and a Gold PSU.
What PSU do I need for an RTX 4090?
Full-load draw for a typical RTX 4090 build is about 667 W at the wall. Check the card maker's recommended PSU wattage; it usually adds headroom for spikes.
Get real readings. This page can only estimate. The free PCWatts desktop app reads your GPU's actual watts while you play and turns them into dollars per game, per day and per month.
Download PCWatts for Windows (coming soon)