Hi John,
For darktable performance it is I think a card's OpenCL benchmark you should
be looking at primarily. If you can find a specific OPenCL float benchmark
that would be ideal but I haven't seen those published myself.
The general rule for dt is that you should have at least 1G memory on the card.
Some AMD card (including mine) only make half of the memory available to
OpenCL/dt but even so mine runs absolutely fine with 14Mp raws in its available
0.5G. That said I would have purchased a 2G card if a sensible one was
available at the time. Performance wise, even my lowly silent AMD 6700 card is
pretty much instantaneous for most operations so I feel no need for anything
faster.
As regards drivers, AMD and Nvidia can be equally problematic I find. I jumped
ship from Nvidia because at the time you had to choose between either
proprietary Nvidia drivers that worked for OpenCL and hence dt or open source
drivers that worked with Linux colour management and screen calibration but not
OpenCl. This may have been resolved by now but if you need both OpenCL and
colour management beware.
Rgds,
Rob.
From: John Jumper [mailto:[email protected]]
Sent: 02 March 2014 23:29
To: [email protected]
Subject: [Darktable-users] Purchasing a GPU with darktable in mind
Hello,
I am interested in purchasing a new GPU for my linux desktop, and darktable
performance on ~25 MB raw files is a major consideration. Is there any solid
benchmarking of darktable on various GPUs or any substantial architectural
differences between the AMD and Nvidia cards? How much GPU memory is required
to process 20 megapixel images?
I am hoping to buy an Nvidia card because I have had a ton of problems with AMD
drivers on linux. Since darktable is float based, can I just assume that
darktable performance roughly scales with the peak FLOPS of the card, as long
as I have enough memory?
Thank you for any help you can offer,
John Jumper
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