for about 6 months barefeat uses (beside LUXMARK OpenCL) OctaneRender , which is CUDA(Nvidia) only as benchmark.
Bildschirmfoto 2013-08-24 um 10.18.21.jpg 259.57KB 10 downloads
1. CUDA drivers (works also on 10.9 DP6 for me!) installed (no restart needed )
2. The Octane Renderer Demo (works for me also with 10.9)
http://render.otoy.com/downloads.php (Mac Version)
3. Octane Demo scene files
To compare to barefeats results (lots since 6 Months on his site) http://www.barefeats.com/gpu680v7.html
use the demoscene RenderTarget PT
My GT 440 needs 15:52 Min:Sec for that scene.
GTX 680 (barefeat) needs only 3:09 !!!
Low End CUDA gpus may not work (not enough gpu features) like NVidia 8/9xxxx or GT 2xx.
CPU doesnt matter much (low cpu load).
GTX Titan (oc'ed @1132 Mhz): 1:17 minutes !!
GTX 780 1:22 / 1:29 (SC) / 1:40 Min
GTX 580 OC : 2:35 min
GTX 680 PHANTOM 4GB 2:53
GTX 680 (barefeat) 3:09 min
GTX 560 ti 4:05 Min
GTX 550 ti 7:56 min
GT 640 1Gb DDR-3 - 13:05 min.
GT 440 : 16 Min
GT 430 : 21 Min
PS: Octane cuda renderer renders gpu only. So you cant compare cpu vs gpu.
To see what gpus can do, i run luxmark sala scene GT 440 vs CPU C2D. Even midrange GT 440 only is 20 times faster in that OpenCL raytraycing bench as C2D only. So also Octane CUDA (which didn't have an cpu only feature) will benefit in same range of the gpu speed.
If Octane crashes on start CUDA is missed!
Open Demoscene and render the RenderTarget PT part.