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The early versions of 60-100 MHz Pentiums had a problem in the floating point unit that, in rare cases, resulted in reduced precision of division operations. This bug, discovered in 1994, became known as the Pentium FDIV bug and caused great embarrassment for Intel, which created an exchange program to replace the faulty processors with corrected ones. The 60 and 66 Mhz 0.8 µm versions of the Pentium processors were also known for their fragility and their (for the time) high levels of heat production.
FDIV-Bug
Following S-Spec numbers are affected: | P5-50: | | Q0399 | P5-60: | | Q0352, Q0394, Q0400, Q0412, Q0466, SX753, SX835, SZ949 | P5-66: | | Q0353, Q0395, Q0413, Q0467, SX754, SX837, SZ950 | P54-75: | | Q0540, Q0541, Q0601, Q0606, SX951 | P54-90: | | Q0542, Q0543, Q0611, Q0612, Q0613, Q0628, SX679, SX874, SX885, SX909, SX921, SX922, SX923, SX942, SX943, SX944, SZ951 | P54-100: | | Q0563, Q0587, Q0614, Q0677, SX886, SX910, SX960 |
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