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In Ubuntu, I can underclock the CPU using the CPU freq applet. My netbook is a Intel atom n270, basically single core with 2 "virtual cores" due to hyperthreading. I can underclock one of these virtual cores while having the other stay at 1.6 GHz. Which frequency is my CPU actually running at?

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Even if you were able to, wouldn't it just be pretending to run slower? –  Louis Feb 6 '13 at 23:48
    
Yea, judging by how hyperthreading works arstechnica.com/features/2002/10/hyperthreading , it seems the applet you used in Ubuntu didn't actually detect that it's trying to downclock virtual cores. Both your virtual cores run from a single physical core, so your CPU still run at the exact same speed. –  Martheen Cahya Paulo Feb 7 '13 at 8:35
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