How much power does a Ryzen CPU use when mining Monero?

A desktop Ryzen CPU mining Monero often uses roughly 40–150 watts at the processor, depending on the model and your settings. High-end models at stock power limits can use more, and your whole PC draws extra power for memory, the motherboard, fans, and other parts. For an electricity-cost estimate, measure the PC at the wall rather than relying on the CPU’s advertised wattage.

What changes a Ryzen’s power use?

Monero uses RandomX, a mining algorithm—the work your computer performs to help secure the network. It favors CPUs, but different Ryzen chips complete that work with different amounts of electricity.

Your main variables are:

• CPU model: A six-core Ryzen and a sixteen-core Ryzen have different power limits, even within the same generation.
• Power settings: Stock settings, automatic boosting, and manual limits can change consumption substantially.
• Mining threads: Threads are separate streams of work. Running more can raise power use without giving you an equal increase in mining speed.
• Cooling: Temperature affects how fast your processor can run and how much its fans work.

RandomX needs about 2 MB of L3 cache per mining thread. L3 cache is a small, fast memory area inside your CPU. This is one reason simply choosing the maximum thread count is not always the most efficient option.

Use wattage ranges as a starting point

For modern desktop Ryzen systems running a dedicated miner, these are reasonable rough planning ranges for CPU package power, meaning the power used by the processor package:

• Six- and eight-core models: Often around 40–100 watts while mining.
• Twelve- and sixteen-core models: Often around 70–150 watts with sensible power limits.
• High-end models with generous stock limits or boosted settings: Can exceed 150 watts, sometimes substantially.

These are not guaranteed measurements. Older Ryzen chips, laptop processors, and specialized models can fall outside these ranges.

Also, TDP, or thermal design power, is a cooling-design rating—not a reading of mining electricity use. A Ryzen labeled “65 W” does not mean the entire PC consumes 65 watts, or that the processor always stops there.

Measure the number you actually pay for

A plug-in electricity meter gives you the most useful reading: the power your entire PC takes from the wall.

To test your setup:

1. Measure the PC while it is idle.
2. Start mining and wait until temperatures and power readings settle.
3. Record the wall-power reading and mining speed.
4. Repeat after changing power limits or thread counts.

If your PC draws 120 watts at the wall continuously, it uses:

0.120 kilowatts × 24 hours = 2.88 kilowatt-hours per day.

Multiply that by your electricity price per kilowatt-hour. If you keep the PC running only to mine, count the full wall consumption—not just the increase above idle.

Aim for efficiency, not maximum speed

Mining speed is called hashrate, measured in hashes per second. Compare hashrate with wall power to find how much work you get per watt.

Ryzen’s Eco Mode or a lower CPU power limit may cut electricity use more than it cuts mining speed. Test rather than assume.

Browser mining can behave differently from a dedicated miner because of browser limits and implementation differences. Measure the actual browser session; dedicated-miner figures may not apply.

The bottom line

Use 40–150 CPU watts as a rough starting range, not a promise. Your wall-meter reading, mining speed, and electricity rate tell you what your particular Ryzen setup costs to run.