> this is sort of worrying: why would you want to invest in a graphics
> card if using it (OpenCL) is slower than using the onboard i7 graphics?
The slower performance seems to be only an issue with denoising.
I think OpenCL does not run in i7 onboard graphics (OpenCL is not OpenGL)
OpenCL is not a must. I have no experience with the i7 onboard graphics and
how it supports OpenGL for games.
Of course you can also pick up a nice graphic card later, if budget is
limited.
Have a nice day,
Christian
Am Sonntag, 6. Oktober 2013 schrieben Sie:
> Hei Christian
>
> thanks for your response and the explicit list of components!
>
> However, I have a question:
>
> On So, 2013-10-06 at 00:04 +0200, Christian Kanzian wrote:
> > Am Samstag, 5. Oktober 2013 schrieb Patrick Shanahan:
> > > * Ochal Christophe <[email protected]> [10-05-13 14:42]:
> > >
> > >
> > > Still intending expanding ram to 24mb in the very near future. I
> > > believe the amount of ram on your video card is a large determinator
> > > re speed.
> >
> > So for my setup (i7 2600; 16 GB RAM; GeForce GT 640 2 GB RAM with nivida-
> > driver 325.15; no SSD; Pentax K5 DNG) it take from 2 to 3 sec's. 15-20
> > sec's with denoising.
> >
> > Half a year ago I replaced my nvidia card (512 MB) with a the GT 640
> > (2024 MB) to get OpenCL working, but OpenCL is slower than CPU only in
> > my case. Also X11 is not responsive during export with OpenCL enable. I
> > tried different setting as suggest, but with no big changes.
> >
> > Without OpenCl: [dev_process_export] pixel pipeline processing took
> > 13.919 secs (89.910 CPU)
> >
> > With OpenCL[dev_process_export] pixel pipeline processing took 24.525
> > secs (17.977 CPU)
>
> this is sort of worrying: why would you want to invest in a graphics
> card if using it (OpenCL) is slower than using the onboard i7 graphics?
>
> > I would take:
> > - 16 GB RAM
> > - i7 CPU
> > - recent nvidia card with 2 GB RAM
> > - SSD for the system
> > - 2x2TB drives with RAID 1
>
> greetings
>
> Eildert
>
> > All the best,
> > Christian
> >
> > chri@chk64:~$ darktable -d opencl -d perf
> > [opencl_init] device 0 `GeForce GT 640' has sm_20 support.
> > [opencl_init] device 0 `GeForce GT 640' supports image sizes of 32768 x
> > 32768 [opencl_init] device 0 `GeForce GT 640' allows GPU memory
> > allocations of up to 511MB
> > [opencl_init] device 0: GeForce GT 640
> >
> > GLOBAL_MEM_SIZE: 2047MB
> > MAX_WORK_GROUP_SIZE: 1024
> > MAX_WORK_ITEM_DIMENSIONS: 3
> > MAX_WORK_ITEM_SIZES: [ 1024 1024 64 ]
> > DRIVER_VERSION: 325.15
> > DEVICE_VERSION: OpenCL 1.1 CUDA
> >
> > -------------------------------------------------------------------------
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> > trk _______________________________________________
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> > [email protected]
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