TechCompare LogoTechCompare

How much does a high-end 850 W gaming PC cost to run? Yearly power math

At this assumed wall load, four hours daily cost $178.70 yearly. Eight daily hours double that to $357.41. Replace the example with measured power and your electricity rate before comparing builds.

This example assumes an 850 W wall-load baseline at 80%, or 680 W average draw, for four hours daily. It uses 992.8 kWh yearly and costs $178.70 at $0.18/kWh, about $14.89 monthly. It does not claim that a PC with an 850 W power supply normally draws 680 W.

By TechCompare · Updated

Annual cost
$179
At $0.18/kWh
Monthly cost
$15
4 h/day at 80% load
Annual consumption
993 kWh
850 W load baseline

Calculator

Daily Cost
$0.49
Monthly Cost
$14.89
Yearly Cost
$178.70
993 kWh / year
This exact 850 W at 4 h/day scenario, pre-loaded. Change the load, price, or add a second device to compare.
Edit in the full tool

How this is calculated

An 850 W PSU label describes output capacity. It cannot establish gaming consumption or an average utilization factor. Measure wall power during a representative workload. For measured average watts, use 100% utilization. This scenario deliberately models a heavy 680 W average wall load without assigning it to a specific CPU or GPU.

Verdict

850 W x 0.80 gives the assumed 680 W average wall draw. Multiply by four hours and 365 days, then divide by 1000 to get 992.8 kWh. At $0.18/kWh the bill is $178.70 yearly. This is 70% more energy than the 400 W average scenario on the same schedule. The comparison is between actual load assumptions, not PSU capacities.

More Gaming PC scenarios

500 W gaming PC, 4 h/day
This example uses a hypothetical 500 W wall-load baseline at 80%, giving 400 W average draw during four daily gaming hours.
View details ➜
1200 W workstation, 8 h/day
This example uses a 1200 W wall-load baseline at 80%, giving 960 W average draw over eight daily hours.
View details ➜
100 W home NAS, 24/7
A 100 W home server or NAS running 24/7 at 80% load costs about $126.14 a year to power at $0.18/kWh, $10.51 a month.
View details ➜

Related guides

500 W gaming PC power cost
The mid-tier gaming PC reference this 850 W entry ups from.
View guide ➜

Frequently asked questions

Does an 850 W gaming PC draw 850 watts constantly?
No. If 850 W refers to the PSU, it is output capacity rather than constant consumption. This page separately assumes 680 W average wall draw for its worked example.
How can I reduce the power usage of a high-end gaming PC?
You can limit your frame rates in game settings, enable power-saving mode, or undervolt your graphics card to lower power draw without losing performance.
Is a 1000 W or 1200 W PSU more energy efficient than an 850 W PSU?
Not necessarily. Compare measured efficiency curves at your actual load and input voltage. Capacity alone does not establish which unit wastes less energy.

Related tools

Memory and Storage Throughput Visualizer

Visualize the massive speed difference between CPU cache, RAM, and storage.

Use tool ➜

RAM Latency Calculator

Convert DDR3/DDR4/DDR5 timings (CL, tRCD, tRP, tRAS) into true latency in nanoseconds.

Use tool ➜

RAID Calculator

Calculate usable capacity and fault tolerance for RAID 0, 1, 5, 6, and 10.

Use tool ➜

Data Transfer Calculator

Estimate transfer times for files over USB, WiFi, Ethernet, and more.

Use tool ➜