How much does a high-end 850 W gaming PC cost to run? Yearly power math
A high-end 850 W gaming PC running 4 hours a day at 80% load works out to $178.70 a year at $0.18/kWh, about $14.89 a month. That's 993 kWh annually, or roughly 75% more than a 500 W build running the same schedule, so you're paying about $74 a year for the extra headroom and performance.
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How this is calculated
850 W is the mainstream high-end class in 2026, typically a current-gen flagship GPU (RTX 5080 / 5090, RX 9070 XT) paired with an 80-watt CPU. The PSU rating is the upper bound; actual draw rarely exceeds 500-650 W even in the most demanding games, which is why 80% average draw is the reasonable average. Enthusiast mining-era 1200 W builds are a separate category worth pricing at closer to $300/year on this same schedule.
Verdict
$179 a year for a proper high-end gaming rig is less than most gamers spend on a single AAA game library per year, and it is not a cost driver for the hardware choice. Longer daily hours (8+ as a work-and-play machine) push this toward $350+ and start mattering.
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Frequently asked questions
Does an 850 W gaming PC draw 850 watts constantly?
How can I reduce the power usage of a high-end gaming PC?
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