The reason I took the risk to modify the clock speed is
simple
I will be saying farewell to iPhone. Samsung galaxy S II will be my
next toy. The hardware specification is the best in the market at this moment
(JUNE 2011). It is the best ever performance phone.
I have successfully tested the overclocking and it works
well, I suggest overclock to 533Mhz if you wish to maintain good battery level.
As you can tell iPhone 3G is about maybe 2 years plus? or more? and obviously
the batttery isnt as good as before. At 600 MHz, i have not encounter any
problems or heating problem. GPS software works much smoother with no lag. This
even works on iOS 4.0 – iOS 4.2.1
For your information
iPhone 3G has 620 MHz (under-clocked to 412 MHz) ARM
1176JZ(F)-S Processor. Apple has UNDER-CLOCKED the processor, so we are not
actually overclocking, we just optimized the processor.
iPhone 3GS has 833 MHz (under-clocked to 600 MHz) ARM
Cortex-A8 Processor
iPhone 4 has 1 GHz (under-clocked to 800 MHz) Apple A4
Processor
OK here is the main course
Step by step Instruction
1: SSH into your iPhone open file name fstab which can be
found at /private/etc I suggest you the “fstab” file. I have rename
fstab to fstab(ori)
2: Open up fstab in TextEdit (Mac) or Notepad.
3: Add the following lines:
su
alpine (default password)
sysctl -w
hw.cpufrequency_max=XXX000000 (Replace XXX with the MHz Eg: 533, 600)
sysctl -w hw.cpufrequency=XXX000000
(Similar as above)
sysctl -w
hw.cpufrequency_min=YYY000000 (Replace YYY with the MHz during sleep mode)
Add the above before the existing line1 and line2:
/dev/disk0s1 / hfs rw 0 1
/dev/disk0s2 /private/var hfs rw 0
2
Before you save the file make sure it looks like the
following. In this example I overclocked it to 600 MHz. This is similar to
iPhone 3GS speed! (833 MHz (under-clocked to 600 MHz) with ARM Cortex-A8
processor.
su
alpine
sysctl -w
hw.cpufrequency_max=600000000
sysctl -w hw.cpufrequency=600000000
sysctl -w
hw.cpufrequency_min=475000000
/dev/disk0s1 / hfs rw 0 1
/dev/disk0s2 /private/var hfs rw 0
2
4: Reboot your iPhone
AS USUAL, DO IT AT YOUR OWN RISK…
enjoy!!! and remember to say thank you
ongR






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