Hi!
Thanks for your answers, they make me change my mind.
On question if I want responsiveness or fast export I always prefer
responsiveness in all computer aspekts. I chould chose a faster GPU
instead of lots of memory.
Since the AMD driver seams good - I trust you then you say so - and the
Opencl test shoves that AMD is way faster than Nvidia I chould chose a
AMD card. And with a very quick look I found a Sapphire Radeon HD 7970
3GB GDDR5 that is much faster than NVIDIA 770 and has quite a lot of
memory to and costs quite as much as the NVIDA card I was looking at in
the beginning.
Thanks again for your advice.
Magnus Berg
2013-11-09 08:44, Jiří Netopil skrev:
Hi,
the page bellow may help you in deciding what graphics card is better
in terms of OpenCL performance: http://compubench.com/compare.jsp
I personally use an older AMD HD6850 card on the catalyst driver. I do
not observe any problem regarding the stability. Only drawback of this
older card is that despite the fact it is equipped with 1GB of RAM,
only less then half of it is available for Darktable an any other
OpenCL app. The HD77xx an higher line does not have this issue, see
here: http://devgurus.amd.com/thread/158397
Suni
2013/11/8 Magnus Berg <[email protected] <mailto:[email protected]>>
2013-11-08 22:01, Togan Muftuoglu skrev:
> Hi,
>>>>>> "Ulrich" == Ulrich Pegelow <[email protected]
<mailto:[email protected]>> writes:
> Ulrich> Hi,
> Ulrich> let's hope there is a user who has tested the two
variants and can come
> Ulrich> up with some first hand experience. Else it will be
difficult to get a
> Ulrich> reco.
>
> Ulrich> As an alternative you could have a look at the many
graphic card
> Ulrich> benchmarking data available on the net. Of course
benchmarking
> Ulrich> always is a kind of black art. That said you should
specifically
> Ulrich> look for GPGPU benchmarking figures rather than the
classical
> Ulrich> gaming test suites.
>
> Ulrich> My little bit of experience comes from the phase
when I needed to
> Ulrich> decide between NVIDIA GTX 660 Ti versus AMD HD7950
(both come at
> Ulrich> more or less the same price). I checked both
devices physically
> Ulrich> with darktable and found the NVIDIA to be a big
disappointment and
> Ulrich> the HD7950 to really rock. This was fitting well to
almost all
> Ulrich> published GPGPU benchmarks: the 660Ti is optimized
for gaming
> Ulrich> whereas the HD7950 is a monster when it comes to
computing.
>
> I don't have an experience with other cards but I have Asus
> HD7950-DC2T-3GD5-V2 and using darktable has become really fun,
as all the
> previous time taking tasks are now done in a couple of eye
blicks. Probably
> the 16 GB ram helps also.
>
> Togan
>
Thanks for your answer.
I read in another thread that AMD:s card was much much better on
Opencl
than the NVIDIA ones. But that the drivers wasn't stable. And the user
who tell the story that AMD outperformed NVIDIA didn't recommend
the AMD
card because of that. But if you can tell that the driver int the
Linux
kernel is stable and good I'm more than happy to chose a AMD card.
The question about graphic memory was based on my total lack of
knowledge in the graphic field. If the pictures and their different
changes made in Dark Table is saved in the GPU memory it must be a
good
thing to have lots of memory there, in the same way as it is good with
enough ram. But if the GPU doesn't save pictures and their changes in
memory there can be no use with lots of memory. And it's better to
chose
a faster GPU. That's my theory based on no knowledge at all. :-)
Then it comes to test I must know witch tests that is relevant for
picture work in Dark Table. The only thing I know of Dark Tables
hidden
life, and hove it works, is that it uses the GPU and Opencl to do
the work.
Magnus Berg
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