This article discusses adding an FPU (floating point unit) to any of the following computers:
-Macintosh LC 475
-Performa 475 and 476
-Quadra 605
-Macintosh 57x Family
-Macintosh 630 Family

The Macintosh LC 475, Performa 475 and 476 and the Quadra 605 have a 25MHz 68LC040 microprocessor. Computers in the Macintosh 57x family and the Macintosh 630 family have a 33MHz 68LC040 microprocessor.

In order to upgrade to a microprocessor with a floating point unit (FPU), it is necessary to remove the existing microprocessor from its socket and replace it with a 68040 microprocessorof similar speed. These models have no specific FPU socket on the logic board, thus the requirement to replace the CPU chip.

Such an upgrade would not come from Apple. Apple has no plans to market an FPU upgrade, nor does Apple officially support this configuration.