[mythtv-users] Quick opinions

belcampo belcampo at zonnet.nl
Mon Jun 1 13:51:59 UTC 2009


John Drescher wrote:
>> I too have been looking at these two processors to go with a asus M3N-H/HDMI
>> motherboard.
>> As my system is going to be running 24/7 mainly at idle, looking at the
>> power consumption it appears looking here LINK that the 5050e uses 4watts
>> less than the X2 5400+ at idle, then if we look here LINK it shows that the
>> 7750 uses 7.8watts more than the 5400+ at idle therefore I have assumed that
>> the 7750 uses 11.8watts more than the 5050e at idle.
>> On a UK tariff of approx 13p Kwh that works out at a extra annual cost of
>> 13.44 to run the 7750
>> However if I am unable to get VDPAU working satisfactorily on that board I
>> am unsure whether the 5050e is powerful enough for BBC HD and ITV HD.
>>
> 
> The 2.7 kuma is supposed to be 10% to 30% clock for clock more
> efficient than the older series. Also the kuma X2 is actually a 4 core
> chip (made in the same batch as Phenom 1 chips) but with 2 of its
> cores disabled yet still partially powered so this will explain part
> of the 11W idle difference.
> 
> BTW, one thing you can do to reduce the idle power draw of a cpu is to
> lower its voltage at idle. This underclocking / undervolting is
> basically what AMD does to create the energy efficient desktop chips
> since they use the exact same design and process and are made in the
> same batch / wafer as the non energy efficient cpus. I can go more
> into this if it sounds confusing..
If I understand correct, there is 1 physical designed/manufactured CPU 
where 1 is sold/configured to work at say 100%V and the energy-efficient 
one to work on 80%V with the same horsepower as a result ??
> 
> The following link has a kernel driver for Intel and AMD that allows
> you to lower your idle voltage:
> 
> http://www.linux-phc.org/index.php?sid=ba0356aade078116cf7d4c04a0bc53e5
> 
> John
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