Intel Intel Corporation is an American multinational corporation and technology company headquartered in Santa Clara, California, and Delaware General Corporation Law, incorporated in Delaware. Intel designs, manufactures, and sells computer compo ...

's i486 OverDrive processors are a category of various

Intel i486 The Intel 486, officially named i486 and also known as 80486, is a microprocessor introduced in 1989. It is a higher-performance follow-up to the Intel 386. It represents the fourth generation of binary compatible CPUs following the 8086 of 19 ...

s that were produced with the designated purpose of being used to

upgrade Upgrading is the process of replacing a product with a newer version of the same product. In computing and consumer electronics, an upgrade is generally a replacement of hardware, software or firmware with a newer or better version, in order to ...

personal computer A personal computer, commonly referred to as PC or computer, is a computer designed for individual use. It is typically used for tasks such as Word processor, word processing, web browser, internet browsing, email, multimedia playback, and PC ...

s. The OverDrives typically possessed qualities different from 'standard' i486s with the same speed steppings. Those included built-in

voltage regulator A voltage regulator is a system designed to automatically maintain a constant voltage. It may use a simple feed-forward design or may include negative feedback. It may use an electromechanical mechanism or electronic components. Depending on the ...

s, different pin-outs,

write-back cache In computing, a cache ( ) is a hardware or software component that stores data so that future requests for that data can be served faster; the data stored in a cache might be the result of an earlier computation or a copy of data stored elsew ...

instead of

write-through cache In computing, a cache ( ) is a hardware or software component that stores data so that future requests for that data can be served faster; the data stored in a cache might be the result of an earlier computation or a copy of data stored elsew ...

, built-in

heatsink A heat sink (also commonly spelled heatsink) is a passive heat exchanger that transfers the heat generated by an electronic or a mechanical device to a fluid medium, often air or a liquid coolant, where it is dissipated away from the device, ...

s, and fanless operation — features that made them more able to work where an ordinary edition of a particular model would not. It is based on the Intel486 DX2 microprocessor technology. Each 486 Overdrive typically came in two versions, ODP and ODPR variants. The ODPR chips had 168 pins and functioned as complete swap-out replacements for existing chips, whereas the ODP chips had an extra 169th pin, and were used for inserting into a special 'Overdrive' ( PGA 169) socket on some i486 boards, which would disable the existing CPU without needing to remove it (in case that the existing CPU is surface-mounted). ODP chips will not work in Pre-Socket 1 486 boards due to the extra pin. The ODP and ODPR labeling can be found in the CPU's model number(i.e.: DX2ODPR66).

Models

Models available included: * 20 MHz FSB, 40 MHz clock speed. This version of the 20-MHz Overdrive (ODP) was available for the 16- and 20-MHz Intel486 SX CPU for USD $549. Price were dropped to USD $449 about four months later. * 25 MHz FSB, 50 MHz clock speed. The 25-MHz OverDrive (ODP) version was available for USD $699. This version of CPU price were dropped to USD $599 about four months later. The ODPR486 DX-25 was available for USD $599. * 33 MHz FSB, 66 MHz clock speed. Both ODP486 DX-33 and ODPR486 DX-33 were available for USD $799 each.Intel Corporation, "New Product Focus: End-User: OverDrive Processor For Intel486 DX CPU Multiplies Speed", Microcomputer Solutions, November/December 1992, page 10 * 25 MHz FSB, 75 MHz clock speed * 33 MHz FSB, 100 MHz clock speed Two P54 core Pentium-based CPUs were released for PGA 238

Socket 2 Socket 2 was one of the series of CPU sockets into which various x86 microprocessors were inserted. It was an updated Socket 1 with added support for Pentium OverDrive processors. Socket 2 was a 238-pin zero insertion force (ZIF) 19×19 pin grid ...

Socket 3 Socket 3 was a series of CPU sockets for various x86 microprocessors. It was sometimes found alongside a secondary socket designed for a math coprocessor chip, such as the 487. Socket 3 resulted from Intel's creation of lower voltage microproce ...

-based systems, for more information, see

Pentium OverDrive The Pentium OverDrive was a microprocessor marketing brand name used by Intel, to cover a variety of consumer upgrade products sold in the mid-1990s. It was originally released for Intel 80486, 486 motherboards, and later some Pentium compatible pr ...

References

80486 OverDrive 32-bit microprocessors Computer-related introductions in 1992 Coprocessors {{Microcompu-stub

Models

See also

References