OverDrive
Alternatively referred to as an ODP, which is short for OverDrive Processor; an OverDrive is a microprocessor developed by Intel that was first developed for the 804886 processors and was also available with Intel Pentium processors, Pentium processors with MMX, and the Intel Pentium II processor. The OverDrive is 40MHz or less and does not have a heatsink.
Most motherboards had an additional empty socket to accommodate this OverDrive processor. However, some motherboards had a replacement processor known as the ODPR, or OverDrive Processor Replacement, that would work as a replacement for the current processor in the computer. The above picture is an example of what the OverDrive processor may look like.
Note: The original OverDrive socket is now officially known as the Socket 1 which is a 169-pin PGA socket.
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Today, OverDrive processors are no longer being developed by Intel and are also no longer supported or sold by Intel. There are a few companies that can still supply customers with these processors. However, a user should seriously consider upgrading their computer instead of purchasing an ODP or ODPR.
Also see: Interposer, Processor definitions