How to Build Your First Crypto Mining Rig on a Budget

You can put together a working crypto mining rig for under $800 if you buy used GPUs and skip new cases. Focus on proven cards like RX 580s or GTX 1660s that still hash well for coins such as Ethereum Classic or Ravencoin. The rest of the build is straightforward once you know which parts matter most.

Selecting Used Components That Still Perform

Start with a cheap B250 or B360 motherboard that supports four or more PCIe slots. Pair it with a used Ryzen 5 1600 or Intel i5-6500 and 8 GB of DDR4 RAM. These CPUs cost $40 to $60 on local marketplaces and handle mining software without issues.

The GPUs drive your income. Aim for four cards total. A single used RX 580 pulls about 28 MH/s and sells for $120 to $150. Check seller ratings and ask for hash rate screenshots before buying. Skip anything that has been heavily overclocked or run in dusty farm conditions.

• Power supply: 1000 W 80+ Gold from a known brand, around $90 used
• Risers: PCIe 1x to 16x kits, six-pin powered versions only
• Storage: 120 GB SSD, enough for the OS and mining client

Putting the Hardware Together

1. Mount the motherboard on a wooden frame or open case so air flows freely across the GPUs.
2. Install the CPU, RAM, and SSD first, then boot to BIOS to enable PCIe 1x mode for all slots.
3. Connect the risers to the motherboard and attach each GPU one at a time, powering the risers from the PSU.
4. Wire the GPUs directly to the PSU with separate cables. Do not daisy-chain power connectors.

Test the rig at this stage with a simple stress tool before installing Windows or the mining software. Run it for two hours and watch temperatures. Cards should stay under 70 °C with case fans blowing across them.

Setting Up the Mining Software

Install Windows 10 or Hive OS on the SSD. Hive OS runs from a USB drive and makes remote monitoring easier. Create a wallet address on the coin’s official site, then download T-Rex or lolMiner depending on the algorithm.

Edit the config file with your wallet, pool URL, and worker name. Start the miner and check accepted shares in the first five minutes. If you see rejected shares above 1 percent, lower the GPU memory clock by 50 MHz and test again.

Tracking Daily Costs and Output

Power draw matters more than headline hash rate on a budget build. Measure the entire rig at the wall with a kill-a-watt meter. A four-card RX 580 setup usually pulls 650 to 700 W while mining.

Log your actual numbers for the first week. Adjust fan curves if cards run hot, and replace any riser that causes instability. Small tweaks here often add $10 to $15 per month to your margin without buying new parts.