As you all know Apple has limited the performance of all processors of our iPhone and iPod Touch. So the processors on the devices are not fully exploited, but with overclocking it is very much possible, but only on jailbroken iPhone firmware. The processor of the iPhone 3G is indeed 600MHz, but Apple has limited it to 412 MHz only likewise for iPhone 3GS instead of 833 MHz it is allowed to operate at 600.
After overclocking iPhone or iPod Touch your iDevice will be faster and more efficient. We stress however that the operation is dangerous and might brick your iPhone too. In order to unlock the functionality, follow our guide to overclock your iPhone.
Steps to Overclock or increase CPU Speed of iPhone and iPod Touch
Step 1. Navigate to System/Library/System/System Configuration/PowerManagement.bundle/
Step 2. You will see a file named “com.apple.SystemPowerProfileDefault.plist”
Step 3. Instead of editing, you are just rename it to “SystemPowerProfileDefaultbak.plist” so the device does not recognize it.
Step 4. Do a reboot and you overclock your iPhone.
Increasing the clock speed would degrade the CPU’s lifespan and is therefore not recommended. Do at your own risk. We will not be held responsible for bricking your iPhone or iPod Touch.
Via – hackulo