Two Raspberry Pi (Turbo mode)

What's better than one Raspberry pi? Two.. Necessary when playing with Turbo mode just in case one breaks :-(

Since launch, of the Raspberry Pii overclocking and overvolting the Raspberry Pi by editing config.txt. Overvolting provided more overclocking headroom, but voided your warranty because of the concerned it would decrease the lifetime of the SoC; a sticky bit inside BCM2835 would allow the supplier to spot boards which have been overvolted.

The suppliers have been doing a lot of work to understand the impact of voltage and temperature on lifetime, and are now able to offer a "turbo mode", which dynamically enables overclock and overvolt under the control of a cpufreq driver, without affecting the warranty. They are happy that the combination of only applying turbo when busy, and limiting turbo when the BCM2835?s internal temperature reaches 85°C, means there will be no measurable reduction in the lifetime of the Raspberry Pi.

You can now choose from one of five overclock presets in raspi-config, the highest of which runs the ARM at 1GHz. The level of stable overclock you can achieve will depend on your specific Pi and on the quality of your power supply; apparently Quake 3 is a good stress test for checking if a particular level is completely stable. If you choose too high an overclock, the Pi may fail to boot, in which case holding down the shift key during boot up will disable the overclock for that boot, allowing you to select a lower level.