Work on my mac mini with Intel(R) Core(TM)2 CPU T7200 @ 2.00GHz:
sysctl -a | grep kern.cputhrottle
kern.cputhrottle_curfreq: 1000
kern.cputhrottle_curvolt: 1004
kern.cputhrottle_freqs: 1000 1333 1500 1667 1833 2000
kern.cputhrottle_factoryvolts: 1004 1132 1196 1260 1324 1372
kern.cputhrottle_ctl: 1555
kern.cputhrottle_auto: 1
kern.cputhrottle_targetload: 70
Also work on new macbook pro.

"CoolBook is a good program" but also install one kext into your system and the price for the license is $10 =(

thanks to hint!

I installed it on my iMac C2D

kern.cputhrottle_curfreq: 800
kern.cputhrottle_curvolt: 876
kern.cputhrottle_freqs: 800 1200 1400 1600 1800 2000 2200 2400
kern.cputhrottle_factoryvolts: 876 988 1052 1116 1180 1244 1308 1356
kern.cputhrottle_ctl: 34827
kern.cputhrottle_auto: 1
kern.cputhrottle_targetload: 30

Works like a charm, without any problems