[mythtv-users] Power usage and CPU/GPU combo chips (was Re: 0.25 VAAPI does it work)
Michael T. Dean
mtdean at thirdcontact.com
Thu Oct 11 23:09:03 UTC 2012
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).
Is that the way it works, or am I just dreaming of a perfect world?
(I'm also wondering how to compare power draw of the new combined
CPU/GPU chips to my old systems that have CPUs and separate--whether
integrated on the motherboard or discrete on PCIe cards--GPUs. I'd
assume that the TDP numbers for the CPGPs would be "inflated" to handle
the additional heat load from the GPU--where GPUs can put off quite a
bit of heat when loaded. Anyone have any info on this?)
> (b) my front ends are tiny iscsi devices in tiny mini-itx cases
But, obviously, won't help with physical space limits.
Mike
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