Overclocking

Overclocking

From Wkipedia (http://en.wikipedia.org/wiki/Raspberry_Pi):

Newer versions of the firmware contain the option to choose between five overclock ("turbo") presets that when turned on try to get the most performance out of the SoC without impairing the lifetime of the Pi. This is done by monitoring the core temperature of the chip, and the CPU load, and dynamically adjusting clock speeds and the core voltage. So when there is a low demand on the CPU, or it is getting too hot, the performance is throttled down, but if the CPU has much to do, and the chip's temperature allows it, performance is temporarily increased, with clock speeds up to 1 GHz, depending on the individual board, and on which of the "turbo" settings is used. The five settings are:

"None"; 700 MHz ARM, 250 MHz core, 400 MHz SDRAM, 0 overvolt,
"Modest"; 800 MHz ARM, 300 MHz core, 400 MHz SDRAM, 0 overvolt,
"Medium" 900 MHz ARM, 333 MHz core, 450 MHz SDRAM, 2 overvolt,
"High"; 950 MHz ARM, 450 MHz core, 450 MHz SDRAM, 6 overvolt,
"Turbo"; 1000 MHz ARM, 500 MHz core, 500 MHz SDRAM, 6 overvolt