OpenCL performance on a Mac Pro [Archive]

Andrae Palmer

08-18-2011, 09:16 PM

Is a card like the Radeon HD 5770 supported? If so... is it possible to use two of these cards in a Mac Pro for greater performance?

Rohit Gupta

08-18-2011, 11:44 PM

Is a card like the Radeon HD 5770 supported? If so... is it possible to use two of these cards in a Mac Pro for greater performance?

Currently OpenCL support is limited to 1 GPU. However, ordering two of these lets you use the first one for GUI, and the second one dedicated to OpenCL processing. You can get better performance using a Q4000 as a dedicated processing card though, so the ideal case would be use 5770 for GUI, and the Q4000 for CUDA.

Neil W. Smith

08-19-2011, 06:03 AM

Currently OpenCL support is limited to 1 GPU. However, ordering two of these lets you use the first one for GUI, and the second one dedicated to OpenCL processing. You can get better performance using a Q4000 as a dedicated processing card though, so the ideal case would be use 5770 for GUI, and the Q4000 for CUDA.

Rohit, what's the fastest graphic card combination BMD recommends now for running DV R8? .... we have two DaVinci systems - one fitted with a GT 120 and 3 x GTX 285s (2gbs of VRAM) in an PCIe expansion box and the other with a 4000 and a GTX 480 (with an external power supply). Was thinking of getting another 3 X GTX 285s in an expansion box and using the 4000 or a 120 for running the GUI.

The GTX 480 seems to be a faster card for running DV R8 GPU than the 4000 ... just needs so much power and man, does it run hot! ... was thinking of putting 3 x 480s in the expansion box but then would need to find a way to water cool the beast!

Neil

Andrae Palmer

08-19-2011, 08:30 AM

Currently OpenCL support is limited to 1 GPU. However, ordering two of these lets you use the first one for GUI, and the second one dedicated to OpenCL processing. You can get better performance using a Q4000 as a dedicated processing card though, so the ideal case would be use 5770 for GUI, and the Q4000 for CUDA.

Will the performance be increased using two ATI Radeon 5770 instead of just one? Currently at 1/2 Res High on a 12 core Mac Pro getting around 16FPS with just one ATI 5770 card. Just wondering if OpenCL performance will even get close to CUDA performance on the Quadro 4000. With the Quadro 4000 I'm getting realtime performance at 1/2 Res. Good.

Rohit Gupta

08-19-2011, 04:11 PM

Will the performance be increased using two ATI Radeon 5770 instead of just one? Currently at 1/2 Res High on a 12 core Mac Pro getting around 16FPS with just one ATI 5770 card. Just wondering if OpenCL performance will even get close to CUDA performance on the Quadro 4000. With the Quadro 4000 I'm getting realtime performance at 1/2 Res. Good.

Try changing the sizing filter to Bilinear, and it should speed up the OpenCL performance. I think using two 5770s should help since one will be used for GUI, and one for OpenCL compute.

Rohit Gupta

08-19-2011, 04:16 PM

Rohit, what's the fastest graphic card combination BMD recommends now for running DV R8? .... we have two DaVinci systems - one fitted with a GT 120 and 3 x GTX 285s (2gbs of VRAM) in an PCIe expansion box and the other with a 4000 and a GTX 480 (with an external power supply). Was thinking of getting another 3 X GTX 285s in an expansion box and using the 4000 or a 120 for running the GUI.

The GTX 480 seems to be a faster card for running DV R8 GPU than the 4000 ... just needs so much power and man, does it run hot! ... was thinking of putting 3 x 480s in the expansion box but then would need to find a way to water cool the beast!

Neil

Hi Neil,

Using only the official NVIDIA supplied cards for Mac, the GTX285 is probably the fastest, with the Q4000 close behind. The flashed GTX 470 cards from eBay seem to run pretty fast, but is unsupported officially for Resolve. Few users are running it successfully though, it seems. On Linux, we support the GTX 580 cards, and with 4 of them, or 8 of them, you have a really fast Resolve!

Regards,
Rohit

Andrae Palmer

08-19-2011, 07:39 PM

Try changing the sizing filter to Bilinear, and it should speed up the OpenCL performance. I think using two 5770s should help since one will be used for GUI, and one for OpenCL compute.

Thank you Rohit! That did the trick.... now getting realtime once again. Haven't noticed an effect on quality... how is bilinear different from the normal resize filter?

Will Keir

04-21-2012, 08:40 PM

Speed wise, how does the GTX 580 compare to the older GTX 285? Is the apple upgrade ATI 5780 faster than the 285?

Hi Neil,

Using only the official NVIDIA supplied cards for Mac, the GTX285 is probably the fastest, with the Q4000 close behind. The flashed GTX 470 cards from eBay seem to run pretty fast, but is unsupported officially for Resolve. Few users are running it successfully though, it seems. On Linux, we support the GTX 580 cards, and with 4 of them, or 8 of them, you have a really fast Resolve!

Regards,
Rohit

Rob Ruffo

04-23-2012, 06:44 AM

Will the performance be increased using two ATI Radeon 5770 instead of just one? Currently at 1/2 Res High on a 12 core Mac Pro getting around 16FPS with just one ATI 5770 card. Just wondering if OpenCL performance will even get close to CUDA performance on the Quadro 4000. With the Quadro 4000 I'm getting realtime performance at 1/2 Res. Good.

forget it. Go NVidia. Much more speed, much more stability in resolve and Premiere.