I got some **** resource, and hard underclock my MBP A1226 (C2D 2.2GHz, GF 8600M 128M) to 1.46GHz (133MHz*11). FSB could be 100MHz, 133 and 166. when performance is not a big deal, underclocking reduces heat (it can reach 100degC before) and gets more battery life.
I'll post the method here or ifixit.com later.
KNOWN ISSUE:
The clock and video playback became slower. by resetting SMC and PRRAM, the problem solved last night. but this noon, they got slower again. I need your help.
and, I'll try undervoltage later.
updated sept. 2, 2011:
add my xnu-speedstep-air . Great thanks to Reid (https://github.com/reid/xnu-speedstep-air) and , of course, xnu-speedstep project
usage of IntelEnhancedSpeedStep.kext
1. remove /Sys.../Lib..../Ex.../AppleIntelCPUPowerManagement*.kext
2. edit IntelEnhancedSpeedStep.kext/Contents/Info.plist , add Frequency and Voltage of your CPU.
3. copy IntelEnhancedSpeedStep.kext to /S/L/E
4. VERY IMPORTANT!! get this http://blog.nawcom.com/?p=806 SleepEnabler.kext and copy to /S/L/E. because removeing AppleIntelCPUPowerManagement* looses sleep function, it might get very dangerous.
ref:
https://github.com/reid/xnu-speedstep-air
http://ktmtt.com/diary/2011-lion-coolbook.html (japanese page)
http://code.google.com/p/xnu-speedstep/
I'll post the method here or ifixit.com later.
KNOWN ISSUE:
The clock and video playback became slower. by resetting SMC and PRRAM, the problem solved last night. but this noon, they got slower again. I need your help.
and, I'll try undervoltage later.
updated sept. 2, 2011:
add my xnu-speedstep-air . Great thanks to Reid (https://github.com/reid/xnu-speedstep-air) and , of course, xnu-speedstep project
usage of IntelEnhancedSpeedStep.kext
1. remove /Sys.../Lib..../Ex.../AppleIntelCPUPowerManagement*.kext
2. edit IntelEnhancedSpeedStep.kext/Contents/Info.plist , add Frequency and Voltage of your CPU.
3. copy IntelEnhancedSpeedStep.kext to /S/L/E
4. VERY IMPORTANT!! get this http://blog.nawcom.com/?p=806 SleepEnabler.kext and copy to /S/L/E. because removeing AppleIntelCPUPowerManagement* looses sleep function, it might get very dangerous.
ref:
https://github.com/reid/xnu-speedstep-air
http://ktmtt.com/diary/2011-lion-coolbook.html (japanese page)
http://code.google.com/p/xnu-speedstep/
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