On Wed, Apr 24, 2013 at 8:26 AM, Ulrich Pegelow <ulrich.pege...@tongareva.de
> wrote:
> Am 24.04.2013 07:05, schrieb Janne Kurri:
>
>>
>> What I'm getting at with this is if it actually makes sense
>> to use a second gpu if there's a quick-ish cpu available as it doesn't
>> seem like there's a lot to do for that second gpu.
>>
>
> When looking for a processing device darktable always takes any available
> GPU before falling back to CPU.
>
> Center view image and preview image are frequently processed in parallel
> (at any module parameter change). Therefore if you have two GPU devices
> both will be used in parallel. If one is slower than your CPU in fact you
> lose processing speed.
>
> When generating thumbnails you can adjust how many parallel processes you
> want to have (core options: number of parallel threads). In your situation
> with 1 fast CPU, 1 fast GPU, 1 slow GPU you might get a little bit of
> improvement if you select three, but only if there are a lot of thumbs to
> be generated.
>
> General recommendation: don't use a slow GPU with OpenCL if you have a
> fast CPU.
>
> Ulrich
>
>
My 2 gpu cards actually appear to be quite equivalent to cards mentioned
here http://www.darktable.org/usermanual/ch07s02s07.html.php according to
this
http://www.tomshardware.com/reviews/gaming-graphics-card-review,3107-7.html
I guess I'll just have try and see - as soon as I find a way to route power
to that second gpu :)
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