What parts do I need to build a Monero CPU mining rig?

To build a Monero CPU mining rig, you need a processor, a matching motherboard, memory, cooling, a power supply, a small storage drive, and a case or secure frame. Spend most of your attention on the CPU and its electricity use—not an expensive graphics card—because Monero’s RandomX mining algorithm is designed to favor processors.

Choose your CPU and motherboard together

The CPU is your main mining part. RandomX is the set of calculations your processor runs to help secure Monero’s network.

Look for a CPU with:

• Strong RandomX results in independent mining tests.
• Plenty of L3 cache, a small, fast memory area inside the processor.
• Good performance for each watt of electricity used.

RandomX needs about 2 MB of L3 cache per active mining thread. A thread is one stream of work. Cache is not the only limit, so the CPU with the most advertised threads is not automatically your best choice.

Modern AMD Ryzen processors are common choices. Server processors can also work well, but include the cost of their boards, memory, cooling, and electricity before buying.

Your motherboard must support the CPU’s socket, processor generation, and memory type. Check its CPU support list: some boards need a firmware update before they can start with a newer processor. Favor reliable processor power circuitry over gaming extras.

Get enough memory and simple storage

For a basic dedicated rig, 8 GB of RAM is a practical starting point; 16 GB gives you more room. RAM is the computer’s working memory.

RandomX’s fast mode uses a 2,080 MB dataset, a large collection of data used during mining, plus supporting memory. That dataset is generally shared between mining threads, not allocated separately for each one. Light mode uses a 256 MB cache but is much slower, so it is not a good target for a dedicated rig.

Buy:

• A matched pair of compatible RAM sticks, using the motherboard’s recommended slots.
• A small solid-state drive, or SSD, for your operating system and mining software.

Using both memory channels lets the CPU access memory through two paths. Memory speed and response time can affect results, but premium RAM may not repay its extra cost. You do not need to store the full Monero blockchain unless you also choose to run your own network node.

Size cooling and power for continuous use

Mining keeps your processor busy for long periods. Choose a cooler that fits both the CPU socket and your case, and can handle sustained operation.

Your supporting parts should include:

• CPU cooler and thermal paste: Paste fills tiny gaps between the processor and cooler.
• Case fans: These move hot air out and fresh air in.
• Quality power supply: Choose enough capacity for the whole system, with reasonable spare capacity.
• Case or secure frame: Protect components from spills, pets, and accidental contact.
• Wall-power meter: Measure actual electricity use rather than relying only on software estimates.

Skip unnecessary extras

You normally do not need a powerful graphics card. Integrated graphics or a motherboard display controller is enough for setup; otherwise, you may need a basic card.

You also need internet access and, initially, a monitor and keyboard. For browser mining, confirm the service’s hardware requirements and payout terms first. Browser performance can differ substantially from dedicated mining software, so do not base a purchase on desktop-miner benchmarks alone.

The bottom line

Build around an efficient CPU, compatible board, enough RAM, and dependable cooling and power. Before buying, compare the complete build cost and your electricity rate in a live mining calculator. Mining income is not guaranteed.