How Bitcoin Mining Hardware Evolved

When Satoshi Nakamoto mined the genesis block in January 2009, the hardware was an ordinary computer's CPU. At the time a single laptop could fill several blocks a day, and mining was a programmer's experiment. The era in which anyone could participate in mining was the CPU era.

From 2010, graphics cards (GPUs) changed the game. GPUs are optimized for parallel computation and could calculate hashes hundreds of times faster than CPUs, and multi-card 'rigs' became the standard for hobbyists. More power-efficient FPGAs briefly took the lead in 2011–2012, but they were only a transition toward ASICs.

The decisive shift came in 2013 with ASICs. An ASIC (Application-Specific Integrated Circuit) is a custom chip designed to do only one thing — compute SHA-256 hashes — and delivers dozens of times the hash of a GPU for the same power. With ASICs, GPU and CPU mining lost profitability, and bitcoin mining became a specialized semiconductor machine industry. Today, 'bitcoin mining rig' means an ASIC miner.

An ASIC miner is a box. Inside are several hashboards — circuit boards carrying the ASIC chips — plus large fans to dissipate the heat and a power supply unit (PSU). Operating noise is typically 70–75 dB, loud enough to make conversation difficult and unsuitable for a living room or office.

The key metric for comparing miners is efficiency (J/TH): the energy needed to produce 1 TH/s of hash. Lower is better. The 2020-generation Antminer S19 ran at about 34.5 J/TH; the 2024-generation S21 is about 17.5 J/TH — roughly half. For the same electricity bill you get about twice the hash, and that difference is exactly the difference in mining cost.

Efficiency determines survival for a simple reason. Revenue is 'bitcoin price × your share' while cost is 'electricity price × power draw,' so at the same electricity rate the less efficient machine reaches loss territory first. Each halving cuts rewards in half, and the least efficient models are the first to be switched off. That is why the hardware market converges on a single variable: efficiency.

The bitcoin ASIC market is effectively split between Bitmain (Antminer brand) and MicroBT (Whatsminer brand). Most of the world's mining facilities run on these two brands, with Canaan (Avalon) and a few others behind them.

As a representative recent generation, the Antminer S21 delivers about 200 TH/s at 17.5 J/TH, and higher-end models reach 270 TH/s at around 13.5 J/TH. MicroBT's M60–M66 series competes at similar efficiency levels. Real-world efficiency is always worse than the datasheet depending on cooling, power quality and altitude, so buyers should judge on measured numbers, not catalogs.

Individuals acquire machines in two ways: buying directly, or hosting contracts. Direct purchase means owning the machine but solving the location, power and noise problems yourself. Hosting means placing the machine in a facility in a low-tariff region and paying electricity and operations fees — accepting the reliability and contract risks of remote hardware. The large companies covered on the Miners page run this structure at industrial scale.

Let's put numbers on it. A 200 TH/s machine at 17.5 J/TH draws about 3,500 watts. Running 24/7, that is 84 kWh per day, or roughly 2,520 kWh per month. At residential electricity rates (with tiered pricing, roughly $0.10–0.25 per kWh in many markets) the power bill alone reaches several hundred dollars a month.

Revenue is decided by hashprice — the expected revenue of 1 PH/s per day — which swings widely with bitcoin's price and network difficulty, usually in the tens of dollars. For a 0.2 PH/s machine that means a few to a dozen-plus dollars per day. Compared with a residential power bill, home mining is in loss territory most of the time. Where industrial power costs a few cents per kWh, the math flips — which is why the industry chases cheap electricity around the world.

There are barriers beyond cost: 70 dB-plus noise, tens of kilowatts of heat, and wiring and fire risks that most apartments and offices do not allow. In practice, since 2013 home mining has rarely paid back the hardware unless electricity was nearly free; buying and holding bitcoin with the same money has more often been mathematically superior. This page neither recommends nor discourages buying a rig.

The physical lifespan of a miner is longer than people assume. With fans and power supplies replaced, the ASIC chips themselves run for years. But the economic lifespan is much shorter: a more efficient generation appears, a halving cuts rewards, difficulty rises, and the older machine's profitability collapses quickly. A miner's value is set not by its failure rate but by its efficiency gap to the next generation.

This depreciation shows up directly in the second-hand market. When a new model ships, used prices of the previous generation fall sharply within months, and surviving machines migrate to regions with cheap power. They run while profitable, then become spare parts or scrap. A mining rig is closer to a tool than to an asset that holds its value.

In the end, the history of mining hardware answers a different question from the one bitcoin holders ask. Mining is a race of electricity and efficiency; accumulation is a race of time and patience. Two notes matter here: most mining companies sell a substantial share of what they mine to cover operating costs, and for individuals, direct ownership is usually structurally more favorable than buying a rig.