[mythtv-users] silent and low-power: AMD or Intel?
mythlist at assursys.co.uk
Sat Jun 6 08:27:26 UTC 2009
On Fri, 5 Jun 2009, John Drescher wrote:
>> AFAIK and it was discussed on this list, frequency scaling on Intel is
>> only useful to limit a processor from over-heating and will not change
>> the power consumption significantly, if at all
> I have just tested and verified this on with a brand new core2 quad
> 9650 3.0GHz here at work.
My observations conflict with this statement.
I have a Core2 Quad Q6600 also on an Asus P5Q board. It has 4GB of memory, 2
1TB SATA HDDs, 2 200GB PATA HDDS, a Promise PATA card, a Hauppauge Nova-T
DVB card, a Lite-On DVD-Rom drive and a Sony Optiarc writer. At idle on a
GNOME desktop, my no-name power meter shows the system drawing about
107-116W. The system runs FC10, and uses the ondemand governor module
(acpi-cpufreq) in the 126.96.36.199-170.2.68.fc10.x86_64 kernel.
I started up four terminal windows and in each ran:
while [ true ]; do true; done
Each instance causes one core to jump from 1.6GHz to 2.4GHz. I then killed
them off one by one and recorded the power consumption.
The TDP of the Q6600 is 105W. (105W/2400MHz)*1600MHz=70W, so the power
savings are better than one would expect from a simple frequency comparison.
Intel's TDP definition is a typical, rather than maximum power consumption,
so this is also a contributory factor.
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