Cpuminer OPT is a free, open-source mining program for Windows users who want to mine cryptocurrency with their computer's processor instead of dedicated graphics hardware. It suits hobbyists, students and home miners who already own a 64-bit PC and want to experiment with CPU mining. The project is a fork of cpuminer-multi with added performance work from several contributors.
The program connects to mining pools over the Stratum protocol and supports a range of proof-of-work algorithms, so it can handle several different coins. The latest release is v27.4, and the code was last updated on January 13, 2026, which means the project is still actively maintained. Before you start, check whether your processor meets the requirements, because mobile chips and some older processors may not be suitable.
How CPU Mining Differs from GPU Mining
CPU mining uses the main processor in your computer to compute the hashes that proof-of-work networks require. GPU mining uses graphics cards, which contain many smaller cores designed for parallel calculations. For many algorithms, a graphics card produces far more hashes per second than a typical processor, so most large-scale miners rely on GPUs or specialized hardware.
That does not make CPU mining pointless for everyone. A processor is already installed in every PC, so the entry cost is mainly the software and electricity rather than new hardware. CPU mining is also a practical way to learn how pools, wallets and hashrate interact before you invest in other equipment.
The trade-off is output. A CPU miner will usually report a lower hashrate than a mid-range GPU, and it keeps the processor under sustained load, which raises heat and power use. Monitor temperatures and consider limiting the number of threads so the system stays responsive during mining.
Who Is Cpuminer OPT For?
Cpuminer OPT suits technically comfortable users who want to experiment with cryptocurrency mining on a desktop they already own. A typical example is a developer who wants to see how a Stratum connection behaves, or a hobbyist testing whether an older desktop is useful for a small mining setup.
It is also a fit for people who value open source. Because the source code is public on GitHub, users can read the project, follow its history and build the software themselves if they prefer. Students and researchers studying proof-of-work algorithms can use it to compare how different hash functions perform on the same machine.
It is less suitable for people who expect a polished tool with heavy built-in management features. Those needs are better served by other programs in the category, so it is worth comparing options before you choose a miner for a long-term setup.
What Hashrate and Mining Pools Mean for Your Results
Hashrate measures how many hash calculations your miner completes per second. It is the most common way to compare miners, but a higher number does not automatically mean higher earnings, because pool fees, network difficulty and coin price also matter.
Most individual miners join a pool rather than mining alone. A pool combines the hashrate of many participants and shares rewards in proportion to the work each one contributes. Cpuminer OPT connects to pools using the Stratum protocol, so you need the pool's address and the port it publishes for your chosen algorithm.
Pool choice affects your experience as much as hardware. Look at the fee structure, payout method and minimum payout, and confirm that the pool supports your coin. Read each pool's documentation carefully, because rules differ widely between operators.
Key features
Support for 64-bit processors
Runs on 64-bit operating systems
Stratum pool connections
Supported coins
The project documentation names Bitcoin (BTC), Dash, Decred and Vertcoin as networks the miner can work with. The algorithm list covers SHA-256, Scrypt, CryptoNight, Argon2, X11, X16R, Lyra2 and SHA512256d. Support for a specific coin depends on the algorithm it uses, and mining pools may add their own requirements. Check that your coin and pool use an algorithm on this list before you configure the miner.
How to install Cpuminer OPT on Windows
- 1
Download the release from the official source
Download the program from the project's GitHub Releases page at github.com/JayDDee/cpuminer-opt, or from the official website if one is linked there. Avoid mirrors and file-sharing sites, since a modified build could contain malware. Choose the Windows build or installer that matches your 64-bit system.
- 2
Check the version and release notes
The latest version is v27.4. The release includes a RELEASENOTES file that describes recent changes, and the repository's INSTALLWINDOWS guide explains the setup in more detail. Read both before installing, especially if you are upgrading from an earlier build.
- 3
Verify the file
Compare the SHA-256 checksum of the downloaded file with the value published by the project. If a digital signature is available, check it as well. Do not run a file that fails verification, and delete it if the values do not match.
-
Extract and launch the program
Extract the archive to a dedicated folder in your user directory so that your settings and logs stay together. Launch the program, then enter your pool address, port, worker name and wallet settings as described in the documentation. Start with a short test session before running longer.
System requirements
- 64-bit version of Windows
- 64-bit x86-64 processor from Intel or AMD with SSE2 support
- 64-bit ARM (aarch64) processor with armv8 and NEON support
- Desktop processors are the recommended choice; mobile CPUs such as those in laptop computers are not recommended for mining with this program
How to use Cpuminer OPT
Using Cpuminer OPT comes down to choosing a pool, entering the right settings and watching how the miner performs. The steps below follow a sensible order for a first session on a Windows desktop.
- Confirm that your processor supports SSE2 (x86-64) or armv8 with NEON (ARM) before you start.
- Choose a mining pool that supports the algorithm and coin you plan to use, and note its stratum+tcp or stratum+ssl address and port.
- Prepare a wallet address that you control to receive payouts, and copy only the public address into the settings.
- Enter the pool URL, port, worker name and wallet details in the configuration, double-checking each value.
- Start the miner for a short test run and watch the reported hashrate and the stability of the output.
- Monitor processor temperature and power draw during the test, and reduce the number of threads if the system becomes unresponsive.
- Review pool statistics after the session, then decide whether to continue, adjust settings or stop.
Pros & cons
- Free to use, with source code published openly on GitHub
- Supports both x86-64 and ARM 64-bit processors
- Offers encrypted stratum+ssl connections to pools
- Covers a wide range of proof-of-work algorithms
- Builds on optimizations imported from several established miners
- Windows build or installer is available
- Laptops and other mobile CPUs are not recommended for mining
- Setup requires comfort with pool settings and configuration
- CPU mining generally produces a lower hashrate than dedicated GPU hardware
- Mining software is often flagged by antivirus tools, which can require careful handling
- The project itself points some users toward cpuminer-multi instead
Is Cpuminer OPT safe?
Cpuminer OPT is open source, and its code is hosted publicly on GitHub. Its most recent code update was on January 13, 2026, so the project is actively maintained. Download the program only from the official source, verify the SHA-256 checksum or signature, and avoid unofficial builds from forums or file-sharing sites.
Antivirus software often flags mining programs, so expect warnings. Never disable your protection entirely; instead, confirm the file hash and add a narrow exception only if you are certain the file is authentic. Miners do not need your seed phrase or private keys, so never enter them into the program or on any website. Confirm the latest version on the official website before installing.
- Official source only. Download from github.com/JayDDee/cpuminer-opt. Ignore ads and lookalike domains.
- Check the SHA-256. Compare the installer hash with the value the developer publishes before running it.
- Never share your seed phrase. No developer, support agent or website — including CryptApps — will ever ask for it.
Alternatives
Cpuminer OPT sits between the original cpuminer-multi and GPU-focused tools. Its optimizations target CPU performance, while cpuminer-multi is the unoptimized option the project recommends to some users who want a simpler base. Cpuminer OPT is therefore the better fit if you want the extra optimization work on a processor.
Compared with GPU miners such as GMiner or BzMiner, Cpuminer OPT uses your processor rather than graphics cards, so it makes sense on a PC without a strong GPU. ccminer Verus covers CPU and ARM use for Verus specifically, which makes it narrower in scope. T-Rex Miner's development has stopped, and Claymore Dual Miner is an archived program, so neither is a good base for a new setup. For an actively maintained CPU option, Cpuminer OPT is a strong candidate.
Specifications
- Price
- Free
- Type
- Open source
- License
- —
- Latest version
- v27.4
- Last update
- 13 Jan 2026
- Windows support
- Yes (Windows build or installer)
- Source code
- github.com/JayDDee/cpuminer-opt
Frequently asked questions
Yes, Cpuminer OPT is free and open source. Its source code is published on GitHub, so anyone can review how the program works. Use the official source to avoid modified builds. There is no license fee for the miner itself, but electricity, cooling and hardware wear are real costs of running any miner.
Yes. The project provides a Windows build or installer, and the program requires a 64-bit version of Windows along with a compatible processor. Windows is one of several platforms the project lists, alongside Linux, macOS and BSD, so the same codebase covers multiple systems.
It can be used safely if you take basic precautions. Obtain the file from the project's official source, check its checksum or signature, and keep your private keys and seed phrases away from the miner and any website. Mining software sometimes triggers antivirus alerts, so review each alert carefully before deciding what to do.
The project documentation lists Bitcoin (BTC) among the networks it mentions, along with Dash, Decred and Vertcoin. Whether CPU mining Bitcoin is practical depends on your hardware, your pool and current network conditions. Research those factors yourself before committing time or electricity to the effort.
Laptop and other mobile processors are not recommended for this program. Sustained mining loads can push a laptop's cooling and power limits, which can affect stability and battery health. A desktop processor is the more suitable choice for a steady mining session.
No. Cpuminer OPT is a fork of cpuminer-multi that includes optimizations imported from other miners and additional work by Jay D Dee. The project itself recommends cpuminer-multi to some users, so consider which build fits your hardware and goals before choosing one.
No. The program only performs the hashing work, and your results depend on hashrate, power costs, pool fees, coin prices and network difficulty. No miner can promise profit. Calculate expected costs before you start, and treat mining as a financial risk rather than a reliable source of income.
Verdict
Cpuminer OPT is a useful free option for Windows users who want to test CPU mining on a desktop with a 64-bit processor. It is actively updated, open source and offers encrypted pool connections, which makes it more appealing than many tools that are no longer maintained. It is less suited to laptops or to anyone unwilling to manage configuration and verification steps. Keep expectations modest, check the requirements carefully, and compare it with cpuminer-multi before deciding.