Editing Pentium (original) (section)

==={{Anchor|P54C}}P54C===
[[File:Intel Pentium P54C die.jpg|thumb|Intel Pentium P54C die shot]]
The P5 was followed by the P54C (80502) in 1994, with versions specified to operate at 75, 90, or 100&nbsp;MHz using a 3.3 volt power supply. Marking the switch to [[Socket 5]], this was the first Pentium processor to operate at 3.3 volts, reducing energy consumption, but necessitating voltage regulation on mainboards. As with higher-clocked 486 processors, an internal clock multiplier was employed from here on to let the internal circuitry work at a higher frequency than the external address and data buses, as it is more complicated and cumbersome to increase the external frequency, due to physical constraints. It also allowed two-way multiprocessing, and had an integrated [[local APIC]] and new power management features. It contained 3.3 million transistors and measured 163&nbsp;mm<sup>2</sup>.<ref name="MPR 1995-03-27"/> It was fabricated in a BiCMOS process which has been described as both 500&nbsp;nm and [[600 nm process|600 nm]] due to differing definitions.<ref name="MPR 1995-03-27"/>