What is a Bitcoin mining machine?

What is an ASIC miner?

The pool sends the machine work, the chips hash it as fast as they can, and the control board reports back any result good enough to count. Thousands of machines together make a mining farm. Want to compare real models side by side? The hardware comparison lists current ASICs with their rated specs. New to all of this? Start with the complete guide to Bitcoin mining.

Why can’t you mine Bitcoin with a GPU any more?

Graphics cards were the best Bitcoin miners in the early 2010s, in open-frame “rigs” full of cards. Then ASICs arrived, and the gap is now so big that the graphics card barely shows up on the chart.

That’s roughly 37,000 times more work for the same power. Here’s what that old card would mine today against its power bill:

The earnings bar is practically invisible. The catch with ASICs is the reverse: they can’t do anything else. When one stops paying for Bitcoin, you can’t turn it into a gaming or AI machine.

Which specs matter when comparing mining machines?

Here’s a current air-cooled model, the Antminer S21 XP, as its spec sheet lists it:

Manufacturers publish typical figures. Bitmain notes real hashrate can vary by ±3% and power by ±5%. So every model number on this page is manufacturer-rated, not something we measured. To sort today’s models by any of these columns, use the hardware comparison table.

How much have mining machines improved?

The S9 needed about ten times more energy for the same work as today’s best machines. The fleet actually running lags behind the newest models, though. Cambridge’s 2025 industry survey put the average at about 28.2 J/TH in June 2024, and found Bitmain alone held about 82% of the hardware market.

At what electricity price does a machine stop paying?

Miners measure revenue as hashprice: what 1 TH/s is expected to earn in a day. It moves with the network hashrate, the block reward and the bitcoin price.

Divide hashprice by a machine’s energy use and you get the electricity price where it stops earning more than it costs. It only depends on J/TH. How big or expensive the machine is doesn’t change it.

This is why old machines get unplugged even when they still work. And since the network tends to grow, and each halving cuts the block subsidy in half, every machine mines a bit less bitcoin each year. Try your own numbers in the mining profit calculator.

What else does a mining machine need? (The rig)

The machine does the hashing. The rest decides whether you can run it safely, live with the noise and pay the bill. Plan one below: add machines, set your tariff, and see the bill, the heat and the estimated output.

One Antminer S21 XP running all day uses 87.5 kWh and is expected to mine about 0.00016795BTC a day (live estimate, before pool fees). The machine’s price, its falling resale value and the next halving aren’t in that number.

How do you connect a miner to a pool?

On its own, one machine could wait years for a block (the solo mining odds show how long). So almost everyone joins a pool, which combines many miners and splits the rewards by work done. Machines talk to the pool using a protocol called Stratum. Setup takes about five minutes:

1. 1

   Make a pool account

   Add your own Bitcoin address for payouts.

2. 2

   Open the miner’s dashboard

   From a computer on the same network, in a browser.

3. 3

   Enter the pool details

   The pool’s Stratum address, a worker name (often account.worker) and the password the pool asks for.

4. 4

   Check it on the pool

   Your worker should appear with roughly its rated hashrate. Add a backup pool if the firmware allows it.

What do you need before plugging one in at home?

Using Bitmain’s ratings for the Antminer S21 XP as a typical current machine:

Heating with a miner, and the quieter home devices built for it, are covered in mining at home.

Air, hydro or immersion: which cooling?

Nearly every watt a miner uses turns into heat. The same S21 XP chips come in three versions, and the cooling changes a lot:

Liquid cooling makes the most sense when many machines share the pumps, which is why you mostly see it in farms.

How long does a machine last, and what is it worth used?

A machine can keep hashing for years. Fans and power supplies are the usual things to fail, and both can be replaced. What really ends its life is money: once its break-even price drops below your tariff, it’s cheaper to switch it off. That’s also why used machines still sell. A unit that loses money on a household tariff can still earn somewhere with cheaper power. One thing to know before flashing custom firmware: MicroBT’s warranty excludes damage from overclocking and unofficial software.

How do you buy a mining machine without getting scammed?

Mining hardware is expensive, ships internationally and is hard for a beginner to check. Scammers love that.

Also budget for shipping, import duty, spare fans, an electrician and pool fees.

Should you buy a machine or use an app?

If you want to tinker with real hardware, buy a machine and learn everything, power bill included. If you want to mine without the noise, heat and upfront cost, start free in the CloudMineCrypto app: claim the free plan, add more from ads, games, offers and daily check-ins, and your estimated BTC ticks up while your plans run. You withdraw to your own wallet, Lightning included. Paid plans are an optional boost for more speed; they usually mine less than they cost.

Good to know: rewards are estimates, change with the network and aren’t guaranteed. A plan isn’t ownership of, or a dedicated share in, any hardware or pool. Terms apply, see the reward rules.

Frequently asked questions

Sources and further reading

1. Antminer S21 XP specifications (hashrate, power, noise, input, airflow) · Bitmain (manufacturer)
2. Bitcoin miner catalogue (S19, S21 and S23 families) · Bitmain (manufacturer)
3. WhatsMiner M60S specifications · MicroBT (manufacturer)
4. Mining hardware comparison (Antminer S9 and earlier ASICs) · Bitcoin Wiki
5. Non-specialized hardware comparison (CPU and GPU hashrates) · Bitcoin Wiki
6. Stratum mining protocol · Bitcoin Wiki
7. Cambridge Digital Mining Industry Report (April 2025) · Cambridge Centre for Alternative Finance
8. Mining guide: solo and pool mining · Bitcoin developer documentation

Live figures on this page come from the CloudMineCrypto API or from the public blockchain data services named next to them, refresh on a schedule, and are labelled where they appear. This guide is educational and not financial advice. CloudMineCrypto is not an investment product; rewards in the app are estimates and aren’t guaranteed.