Hi.
I have 4000 as gui gpu and 470 as resolve gpu and i get something like this:
V1 2 nodes : 24 fps
V2 4 nodes : 24 fps
V3 6 nodes : 22 fps
V4 12 nodes : 12 fps
V5 NR 4 : 24 fps
V6 NR 4 : 19 fps
V7 NR 4 : 9 fps
V8 NR 4 : 2 fps
I tested on 10.7.3 and with 6 gig ram. Mac Pro 5,1 dual 6 core @ 2.93 ghz.
Sasha got a bit better results but i think it is something to do with my ram being only 6 gigs.
Generally my system is the same he does but he got a bit better results.
You probably should change those 4000 as they are not as fast as one would think.
You probably have seen here daily about 5xx series and probably 6xx series gpu's.
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Margus
http://iconstudios.eu