After the microprocessor was released, a bug was discovered in the floating point unit, commonly called the "Pentium Pro and Pentium II FPU bug" and by Intel as the "flag erratum".
Pärast mikroprotsessori väljalaset avastati programmiviga ujukomaarvude täiturüksuses, mida tuntakse üldiselt "Pentium Pro and Pentium II FPU bug" nime all ning millele Intel andis nime flag erratum.