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Intel OverDrive are a branded family of Intel upgrade processors designed to extend the life of existing 486 and early Pentium systems through socket-compatible replacements or adapter-based upgrades. Early 486 OverDrive parts were typically clock-multiplied derivatives such as 486DX2 and 486DX4 variants, often adding voltage adaptation, write-back cache support, and package changes needed for older motherboards, while later models such as the Pentium OverDrive for 486 platforms integrated a Pentium-derived core behind a largely 486-compatible interface. These processors were constrained by legacy socket, chipset, BIOS, and power-delivery limitations, so they often used unusual mechanical and electrical designs including built-in voltage regulation and attached cooling. Technically, OverDrive CPUs are best understood not as a distinct microarchitectural family but as transitional upgrade products that allowed newer x86 implementations to operate in older systems with minimal platform changes.