Updated: 10/02/2017 by Computer Hope

Short for Floating Point Unit, the FPU is part of a computer specifically designed to perform floating-point mathematical operations. On October 30, 1994, Professor Thomas Nicely sent an e-mail indicating that there was an issue with the Intel Pentium processors and how they perform floating point division.

All 120 MHz and higher Intel Pentium processors are not affected by this issue. However, if you would still like to test for this problem, perform the below calculation in a calculator.

Correct Answer
962,306,957,033 / 11,010,046 = 87,402.6282027341

Incorrect Answer

962,306,957,033 / 11,010,046 = 87,399.5805831329

Correct Answer

4,195,835 / 3,145,727 = 1.33382044913624100

Incorrect Answer

4,195,835 / 3,145,727 = 1.33373906890203759

Another way of testing for this flaw is to use Microsoft Excel and enter the below formula.


When entering this formula, you should receive a returned result of 0.

Coprocessor, Floating-point, Floating-point coprocessor, Floating-point notations, Hardware terms