Comment by qubex

Actually the first generation Socket 4 Pentiums (60 and 66 MHz) had the FOOF bug (and yes, they were bad processors — but overall system architecture with the very first PCI bus implementation with ISA legacy rather than ISA and a single VESA Local Bud expansion) was a huge step forward compared to the 486.

The FOOF bug was actually discovered on the first step of the later 90 MHz Pentium (which was released with the 100 MHz Pentium, which also suffered from the bug). However this was corrected with a hardware stepping. The 75 MHz Pentium was actually released as part of this later stepping, and it was a binned 90/100 MHz part. There were no first step 75 MHz Pentiums.