# Bitcoin mining hardware: hash rate, power and ASIC efficiency Bitcoin mining hardware repeatedly hashes candidate block headers. Purpose-built machines, called ASICs, are designed for that work. Compare hash rate, power measured at the wall, efficiency and operating requirements together. A higher hash rate does not by itself establish lower electricity cost per unit of work, and no specification guarantees mining revenue or profit. Evidence: [Mining](https://developer.bitcoin.org/devguide/mining.html); [S21 User Guide](https://assets-product.bitmain.com.cn/shop-product-s3/firmware/c17a60d7-51c8-41a3-8365-b7e5d1506caa/2025/04/10/14/S21%20User%20Guide-V1.2.5.pdf) Canonical: https://degreesofsatoshi.com/encyclopedia/bitcoin-mining-hardware/ Published: 2026-10-02 Substantively modified: 2026-10-02 Independently verified by an automated reviewer: 2026-10-02T19:29:20.637Z Data current through: 2026-10-02 AI-assisted research and drafting with a separate automated source-verification pass; no external expert or named human review is implied. ## Key facts - **Hash rate:** The rate of candidate hash calculations ([Mining](https://developer.bitcoin.org/devguide/mining.html)) - **Wall power:** Electrical demand under stated conditions ([S21 User Guide](https://assets-product.bitmain.com.cn/shop-product-s3/firmware/c17a60d7-51c8-41a3-8365-b7e5d1506caa/2025/04/10/14/S21%20User%20Guide-V1.2.5.pdf)) - **Efficiency:** Joules per terahash; lower uses less energy per work ([S21 User Guide](https://assets-product.bitmain.com.cn/shop-product-s3/firmware/c17a60d7-51c8-41a3-8365-b7e5d1506caa/2025/04/10/14/S21%20User%20Guide-V1.2.5.pdf)) ## Read the conditions attached to the numbers BITMAIN’s March 2025 S21 guide lists a 200 TH/s variant with typical wall power of 3,500 W and efficiency of 17.5 J/TH at 25°C inlet temperature. This is a dated manufacturer example, not a current buying recommendation. The guide gives hash-rate variation of ±3% and wall-power and efficiency variation of ±5%. It also specifies electrical and environmental requirements. Do not treat a typical rating as a guaranteed measurement in every installation. Evidence: [S21 User Guide](https://assets-product.bitmain.com.cn/shop-product-s3/firmware/c17a60d7-51c8-41a3-8365-b7e5d1506caa/2025/04/10/14/S21%20User%20Guide-V1.2.5.pdf) ## Convert power into energy before pricing electricity At a constant 3,500 W, a hypothetical machine uses 3.5 kW × 24 hours = 84 kWh per day. At an assumed energy price of 0.10 currency units per kWh, that is 8.40 currency units per day for the machine’s electricity. The example excludes cooling, other equipment, downtime, demand charges and purchase costs. Dividing 3,500 W by 200 TH/s gives 17.5 joules per terahash, matching the stated typical efficiency. Evidence: [S21 User Guide](https://assets-product.bitmain.com.cn/shop-product-s3/firmware/c17a60d7-51c8-41a3-8365-b7e5d1506caa/2025/04/10/14/S21%20User%20Guide-V1.2.5.pdf) ## Hardware also needs a valid mining job A hashing device needs software to supply candidate work and submit results. It does not independently decide every transaction or guarantee that a successful-looking result will be accepted by the network. Distinguish local machine performance from accepted work credited by a pool. Connection problems or stale jobs can reduce useful submitted work even while fans run and the device reports a high hash rate. Evidence: [Mining](https://developer.bitcoin.org/devguide/mining.html); [Protocol Overview](https://stratumprotocol.org/specification/03-protocol-overview/) ## Questions ### Does twice the hash rate always mean twice the profit? No. Hash rate describes work, while profit also depends on electricity and other costs, network conditions and the reward arrangement. Compare actual costs and accepted work rather than extrapolating a profit claim from a device label. Evidence: [Mining](https://developer.bitcoin.org/devguide/mining.html); [Can you make money as a Bitcoin miner?](https://f2pool.io/mining/insights/20200903-make-money-bitcoin-miner/) ### Are watts and kilowatt-hours interchangeable? No. Watts measure power; kilowatt-hours measure energy over time. A constant 3.5 kW load consumes 3.5 kWh in one hour and 84 kWh in 24 hours. Evidence: [S21 User Guide](https://assets-product.bitmain.com.cn/shop-product-s3/firmware/c17a60d7-51c8-41a3-8365-b7e5d1506caa/2025/04/10/14/S21%20User%20Guide-V1.2.5.pdf) ## Claims and scope ### bitcoin-mining-hardware-quick-answer Bitcoin mining hardware repeatedly hashes candidate block headers. Purpose-built machines, called ASICs, are designed for that work. Compare hash rate, power measured at the wall, efficiency and operating requirements together. A higher hash rate does not by itself establish lower electricity cost per unit of work, and no specification guarantees mining revenue or profit. Educational explanation. Product-specific behavior is scoped to the cited documentation, checked 2026-10-02. Scope: {"collection":"bitcoin","dataAsOf":"2026-10-02","blockHeight":null} ### bitcoin-mining-hardware-fact-hash-rate Hash rate: The rate of candidate hash calculations Scope: {"collection":"bitcoin","dataAsOf":"2026-10-02","blockHeight":null} ### bitcoin-mining-hardware-fact-wall-power Wall power: Electrical demand under stated conditions Scope: {"collection":"bitcoin","dataAsOf":"2026-10-02","blockHeight":null} ### bitcoin-mining-hardware-fact-efficiency Efficiency: Joules per terahash; lower uses less energy per work Scope: {"collection":"bitcoin","dataAsOf":"2026-10-02","blockHeight":null} ## Sources - [Mining](https://developer.bitcoin.org/devguide/mining.html) — Bitcoin developer documentation. Hardware work, candidate blocks and pool shares; historical examples are not current equipment recommendations. Locator: Mining; Solo Mining; Pool Mining; Block Prototypes. Retrieved: 2026-10-02T18:53:53.955Z. - [S21 User Guide](https://assets-product.bitmain.com.cn/shop-product-s3/firmware/c17a60d7-51c8-41a3-8365-b7e5d1506caa/2025/04/10/14/S21%20User%20Guide-V1.2.5.pdf) — BITMAIN. Manufacturer-rated SHA-256 hash rate, wall power, efficiency and conditions; used as a dated equipment example. Locator: Section 1.2 Server Specification, printed pages 4–5: Table 1-1 Product Glance, Table 1-2 Detailed Characteristics of Product and notes. Retrieved: 2026-10-02T18:55:07.160Z. - [Protocol Overview](https://stratumprotocol.org/specification/03-protocol-overview/) — Stratum V2 specification. Separate mining, job declaration and template distribution protocols. Locator: 3. Protocol Overview: Mining Protocol, Job Declaration Protocol, Template Distribution Protocol and roles. Retrieved: 2026-10-02T18:53:58.669Z. - [Can you make money as a Bitcoin miner?](https://f2pool.io/mining/insights/20200903-make-money-bitcoin-miner/) — f2pool. Historical 2020 account of payout method mechanics. Historical prices, subsidies, pool fees and product recommendations are not current facts. Locator: Mining pool selection: PPS, PPLNS, FPPS and PPS+ definitions; mining economics and cost qualifications. Retrieved: 2026-10-02T19:11:55.963Z. ## Revision history - 2026-10-02: First publication after primary-source research and separate automated verification. ## Cite this entry Degrees of Satoshi editorial project. “Bitcoin mining hardware: hash rate, power and ASIC efficiency.” Published 2026-10-02; updated 2026-10-02. https://degreesofsatoshi.com/encyclopedia/bitcoin-mining-hardware/