i486 OverDrive

Intel's i486 OverDrive processors are a category of various Intel i486s that were produced with the designated purpose of being used to upgrade personal computers. The OverDrives typically possessed qualities different from 'standard' i486s with the same speed steppings. Those 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.

An Intel DX2-66 MHz OverDrive

An Intel i486SX2-50 MHz OverDrive processor installed next to the original i486SX processor.

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
• 25 MHz FSB, 50 MHz clock speed
• 33 MHz FSB, 66 MHz clock speed
• 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 3-based systems, for more information, see Pentium OverDrive

See also

• RapidCAD