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Crypto mining hardware is computing equipment that performs the specialized calculations used to compete for blocks on proof-of-work (PoW) networks. It can be a CPU, GPU, or purpose-built application-specific integrated circuit (ASIC). The right equipment depends on the network’s mining algorithm; a device that works for one coin may not work for another.
What mining hardware actually does
Mining hardware performs repeated calculations that a PoW network uses to select a valid block. It does not, by itself, validate every transaction or guarantee that its owner will earn a block reward. Mining software prepares work for the hardware, and the network’s rules determine whether a result is valid.
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Hardware must be compatible with the particular algorithm used by a network. “Crypto miner” therefore does not mean one universal machine that can mine every cryptocurrency.
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CPU, GPU, and ASIC mining hardware
| Hardware | What it is | Key consideration |
|---|---|---|
| CPU | A computer’s general-purpose central processor. | It can perform mining calculations, but suitability depends on the network’s algorithm and the CPU’s performance and power use. |
| GPU | A graphics processor that can perform many calculations in parallel. | It is more specialized for some computational workloads than a CPU, but is not compatible with every mining algorithm. |
| ASIC | An application-specific integrated circuit built for a particular task or algorithm. | It can be highly specialized for a compatible network, but that specialization limits flexibility. |
The Ethereum Foundation’s 2014 account describes Bitcoin mining’s historical progression from CPUs to GPUs and then ASICs. It reported GPU software speedups of 10–100 times over CPU mining and a further 10–100 times for ASICs over GPUs. Those are historical comparisons from 2014, not current device benchmarks. Ethereum Foundation’s account of mining
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How a Bitcoin ASIC miner works
Bitcoin offers a concrete example of the division between software and hardware. Mining software prepares a block header and sends the 80-byte header, along with a target threshold, to the ASIC. The ASIC repeatedly changes the header’s nonce and calculates a hash, looking for one below the target. As the Bitcoin Developer Guide puts it, “The mining hardware iterates through every possible value for the block header nonce and generates the corresponding hash.” Bitcoin Developer Guide: Mining
When the hardware finds a qualifying hash, it returns the successful header to the software. The software completes and broadcasts the block. The network—not the ASIC alone—determines whether the block meets its rules.
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Solo mining and pooled mining
A miner can work independently or contribute computing power through a pool. In pooled mining, hardware performs calculations and submits “shares” to show the pool that it has contributed work. The pool coordinates miners’ resources and distributes rewards according to its chosen method. A share is evidence of contributed computation; it is not necessarily a block accepted by the network.
Ethereum Mainnet is no longer mined
Ethereum Mainnet has switched off PoW mining and is secured through proof-of-stake validators. Its mining documentation describes a historical system; it is not a guide to mining ETH on Mainnet today. Ethereum.org: Mining
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What to check when comparing mining hardware
A device’s category or advertised speed alone cannot establish whether it is suitable or profitable. Compare the equipment in the context of the network and your operating conditions:
- Algorithm compatibility: Confirm that the hardware can perform the algorithm used by the target PoW network.
- Algorithm-specific output: Compare the device’s hash rate for that algorithm, not a figure for unrelated work.
- Power use and efficiency: Consider electricity consumption alongside the amount of compatible work produced.
- Purchase and operating costs: Account for the device, electricity, pool fees if applicable, ventilation, energy monitoring, and electrical infrastructure.
- Cooling and electrical needs: Check that the site can safely support the device’s power draw and heat output.
Ethereum.org’s historical mining guidance names hardware, electricity, pool fees, ventilation, energy monitoring, and electrical wiring as potential costs. These are useful cost categories, not a current profitability estimate. Actual earnings depend on the device, network conditions, electricity rates, fees, and other costs; hardware type alone cannot answer whether mining will make money. Ethereum.org: Mining costs and context
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