Editing I486 OverDrive

{{Short description|Family of 32-bit microprocessors}}
{{More citations needed|date=March 2024}}
[[File:Intel 486 dx2 overdrive 2007 03 27.jpg|thumb|250px|An Intel DX2-66 MHz OverDrive]]
[[File:I486SX and i486 OverDrive in Socket.jpg|thumb|An Intel i486SX2-50 MHz OverDrive processor installed next to the original i486SX processor.]]<!-- Deleted image removed: [[File:Intel DX4ODP100 overdrive processor.jpg|thumb|250px|An Intel DX4-100 MHz OverDrive with built-in heatsink & voltage regulator.]] -->

[[Intel]]'s '''i486 OverDrive''' processors are a category of various [[Intel 80486|Intel i486]]s that were produced with the designated purpose of being used to [[upgrade]] [[personal computer]]s. The OverDrives typically possessed qualities different from 'standard' [[Intel 80486|i486s]] with the same speed steppings. Those included built-in [[voltage regulator]]s, different [[pin-out]]s, [[CPU cache|write-back cache]] instead of [[CPU cache|write-through cache]], built-in [[heatsink]]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 [[Intel DX2|Intel486 DX2]] microprocessor technology.<ref>Intel Corporation, "New Product Focus: End-User: Intel OverDrive Processors upgrades PC power", Microcomputer Solutions July/August 1992, page 16</ref>  Each 486 Overdrive typically came in two versions, ODP and ODPR variants.<ref>{{Cite web |title=DOS Days - CPUs |url=https://dosdays.co.uk/topics/cpus.php |access-date=2024-03-13 |website=dosdays.co.uk}}</ref> 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' ([[Socket 1|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&nbsp;MHz FSB, 40&nbsp;MHz clock speed.  This version of the 20-MHz Overdrive (ODP) was available for the 16- and 20-MHz [[I486SX|Intel486 SX]] CPU for USD $549.<ref>Intel Corporation, "New Product Focus: End-User: Intel OverDrive Processors upgrades PC power", Microcomputer Solutions July/August 1992, page 16</ref>  Price were dropped to USD $449 about four months later.<ref>Intel Corporation, "New Product Focus: End-User: OverDrive Processor For Intel486 DX CPU Multiplies Speed", Microcomputer Solutions, November/December 1992, page 10</ref>
* 25&nbsp;MHz FSB, 50&nbsp;MHz clock speed. The 25-MHz OverDrive (ODP) version was available for USD $699.<ref>Intel Corporation, "New Product Focus: End-User: Intel OverDrive Processors upgrades PC power", Microcomputer Solutions July/August 1992, page 16</ref>  This version of CPU price were dropped to USD $599 about four months later.  The ODPR486 DX-25 was available for USD $599.<ref>Intel Corporation, "New Product Focus: End-User: OverDrive Processor For Intel486 DX CPU Multiplies Speed", Microcomputer Solutions, November/December 1992, page 10</ref>
* 33&nbsp;MHz FSB, 66&nbsp;MHz clock speed.  Both ODP486 DX-33 and ODPR486 DX-33 were available for USD $799 each.<ref>Intel Corporation, "New Product Focus: End-User: OverDrive Processor For Intel486 DX CPU Multiplies Speed", Microcomputer Solutions, November/December 1992, page 10</ref>
* 25&nbsp;MHz FSB, 75&nbsp;MHz clock speed
* 33&nbsp;MHz FSB, 100&nbsp;MHz clock speed

Two P54 core Pentium-based CPUs were released for PGA 238 [[Socket 2]]/[[Socket 3]]-based systems, for more information, see [[Pentium OverDrive]]

==See also==
*[[RapidCAD]]

== References ==
{{Reflist}}

{{Intel processors|discontinued}}
{{Lowercase title}}

[[Category:Intel x86 microprocessors|80486 OverDrive]]<!--For the sake of sorting within category-->
[[Category:32-bit microprocessors]]
[[Category:Computer-related introductions in 1992]]
[[Category:Coprocessors]]


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