[mythtv-users] Power usage and CPU/GPU combo chips (was Re: 0.25 VAAPI does it work)
Michael T. Dean
mtdean at thirdcontact.com
Sun Oct 14 23:21:50 UTC 2012
On 10/11/2012 07:54 PM, Michael wrote:
> On 10/11/2012 04:09 PM, Michael T. Dean wrote:
>> On 08/07/2012 12:32 PM, fred watt wrote:
>>> NVidia is an option this is easy to to setup with VDPAU - but it means
>>> another card in my frontends for me (a) want to keep as low power as
>>> possible
>>
>> This is often mentioned, and I have to wonder about it. It seems to
>> me that any "sane" design (in this world where AMD/Intel know a thing
>> or 2 about gating--more, it seems, than a certain company that makes
>> a quad-core ARM chip with 5 cores because they couldn't work out
>> separate per-core gating, so it uses either the one-core or the quad
>> core chip at any given time :) for a ceepie-geepie (CPGP, or CPU +
>> GPU, or APU, or ...) would completely shut down power to the on-chip
>> GPU when you disable it. In that case, you'd disable the onboard GPU
>> (and save whatever number of watts it normally draws at idle) then
>> add back in a PCIe (or whatever) GPU that draws some 6-10W at idle (I
>> think the GT220 was 7-9W and the GT430 was like 6-8W, IIRC).
>
> I don't know how it works or doesn't :)
>
> But I have a i5 with built in video. Using the onboard GPU the whole
> system takes 35+ Watts playing back video. If I add a GT430, the
> system now takes 85+ Watts.
You mean during playback (seemingly with the video card heavily
loaded--as the GT430 has a TDP of 49W (and you're seeing a 50+W
difference). In theory, though, it wouldn't be heavily loaded much at
all (maybe during playback--though I don't think that's much of a load
on it?), and it does idle at 7W (according to
http://www.anandtech.com/show/3973/nvidias-geforce-gt-430/17 ), so you
shouldn't be seeing a 50+W difference just from adding the card.
Mike
Mike
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