[ Thanks to Phoronix for this link.
]
“Nearly seven years ago at the Intel Developer Forum in Palm
Springs California, Intel had first demonstrated Geyserville
Technology. This dual-speed technology, when paired with a
0.18-micron mobile Pentium processor, had offered a distinct
advantage as it was able to run in two processing modes–maximum
performance and battery optimized. Geyserville Technology allowed
the processor to run slower and decrease the voltage when the
mobile solution was running off of a battery (in order to reduce
power consumption and allow robust performance without sacrificing
battery life), but when the laptop was then plugged into an AC
outlet, the frequency would return to normal. With the introduction
of the Intel Mobile Pentium 3 processors, the dual-speed
Geyserville was renamed to SpeedStep Technology…”