Hi,

A cheap card won't give you much performance gain. It can be slower than the CPU.


Am 2017-01-13 13:41, schrieb Patrick Rudin:
Stefan Klinger schrieb:

Darktable will be the most demanding task for this piece of
hardware.

Same here.

Same here too. GPU is only needed for darkable.


We pushed Phoronix recently to do some tests:
https://www.phoronix.com/scan.php?page=news_item&px=Darktable-27-Results

[...]

Does anyone have information on / experience with Radeon R7 or similar
(i.e., GCN family of cards [6])?

I have a R9 270X, which is fine so far. But here comes the problem:


The problem is, OpenCL only works so far with the closed
source-drivers. And the closed source AMDGPU-PRO-driver seems not to be
supported by the distros, he is not in the repos.

I'm on Debian 8 and frglx supports my card very well. There is even
a relatively new frglx driver in the backports repository which I use.

frglx was stopped by AMD and AMDGPU-PRO will be the next generation.
So Debian 9 will be released without frglx. AMDGPU-PRO does not support my R9 270X,
which was announce in December 2013.

Debian 9 has the Nividia 375.26 driver, which still supports my
old GT 640 announced mid 2012. On some operations the card is slower than the GPU. Thats why I got the R9 270X in 2015 and in 2017 it will get useless because the closed source driver has no support and the open source driver has no OpenCL.

So bye, bye AMD I will switch back to Nvidia and get one of those suggested:


My personal view: If you want to have OpenCl working today, buy a 1050,
a 1050Ti or a 1060. A 1050 is not much more expensive than a R7.



Christian

regards

Patrick
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