i486 OverDrive

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.

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