Intel 80486 OverDrive

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An Intel DX4-100 MHz OverDrive with built-in heatsink & voltage regulator.
An Intel DX4-100 MHz OverDrive with built-in heatsink & voltage regulator.

Intel 80486 OverDrive processors were a category of various Intel 80486s that were produced with the designated purpose of being used to upgrade personal computers. OverDrives typically possessed qualities different from 'standard' 486s of the same speed steppings. These included built-in voltage regulators, different pin-outs, write-back cache instead of write-through cache, built-in heatsinks, and fanless operation - features that made them more able to work where an ordinary edition of a particular model would not.

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