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Intel Pentium III

Pentium III 866MHz

The Intel Pentium III 866MHz has 1 core that runs at a clock speed of 0.9GHz.

It has an L2 cache size of 256KB and an L1 cache size of 32KB.


Intel Pentium III 866MHz

Cores1More cores means more threads and therefore more processes can be run simultaneously
Speed0.866GHzClock frequency indicates processor speed, but is only reliable in comparisons between CPUs of the same family
CodenameCoppermineThe code name given by the manufacturers
Release Date20 Mar 2000 The more recent the release, the more likely the CPU will receive up-to-date manufacturer support
TDP26WThe lower the TDP, the less power the CPU requires to run and thus the more efficient it is and the less heat it creates
L1 Cache32KBThe bigger the L1 cache, the more data can be stored for lightning CPU access to priority processes (though a bigger cache means a higher latency
L2 Cache256KBAfter L1 cache, L2 is utilized for slower (but still very fast) data access
Lithography180nmThe smaller the lithographic technology used, the less power is required to run the CPU, and the less heat is created during intense use
CPU SocketSocket 370The motherboard socket and CPU socket should match to indicate the CPU is compatible with the motherboard and will fit into it
Unlocked MultipliernoAn unlocked clock multiplier means you can adjust the multiplier for an overclocking speed boost

Pentium III 866MHz compatibility review

Overall, the Intel Pentium III 866MHz has poor performance. Its 1 core clocked at 0.87 GHz provides mediocre processing speeds and with only a single core, it will never match up to modern competitors.

The CPU is now over 21 years old, which means it is extremely out of date and is based on very aged technologies. This processor will be dwarfed in performance by its modern counterparts, and will likely have very little support from Intel.

Created with lithographic technology sized at 180 nanometers, the Pentium III 866MHz is not efficient at all by modern standards, although with a Thermal Design Power of 26W it does not require very much power to run.

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