Hi Tom,
Thanks for the help!
So I'm exploring Octane Render since October 2015, after a few tests, i didn't go far in the exploration cause I'm very focused on the rendering part, even if I do everything (modelling, animation, rendering...) and in October 2015 I had a GTX 970 wich was slow (for me) so I decided to go with a GTX 980 Ti, I got the EVGA Hybrid one due to the high temps I experienced on the 970.
GTX 980 Ti + 970 was confortable! For modelling, exploring, even finishing some scenes but not rendering them as final renders!
Actually, I'm focused on Fulldome content wich is very demanding on rendering, my final renders had to be in 4K between 30 and 60 Fps

After that, I sold my cards to get a pair of GTX 980 Ti AMP! EXTREME by ZOTAC.
Actually I still have them and on Octane bench they scores 278! I'm very impressed by the power, it's like the most powerful 980 Ti i owned. And I didn't overclocked them since they are factory overclocked and the temps are OK 80 degrees max. But their power consumption is high since it take two 8 pins.
Now, I'm thinking to upgrade my setup since I have to render 4K 30-60FPS immersive videos, and I'm very confused! Maxwell vs Pascal, on top of that, AMD! With the update of 3.0 to 3.1 (now I have 2.55 or something like that, we have to buy the update to 3.0).
I think my system can handle 6 or 7 GPU. I have an ASUS P9X79 WS i7 4930K 64gb DDR3 and the two 980 Ti AMP EXTREME.
Before the first question, I have to say that I'm a freelance artist like a lot of us here and I buy all my gear... So I really care about the penny's spanded on the gear.
Actually I have a small budget to add some power.
The question is, is it reasonable to get another two GTX 980 Ti AMP EXTREME wich will cost around 1200$ CAD (it's my actual budget) and render with the 4x980 Ti or waiting for Pascal support and check the benchmarks?
What I can expect from Pascal?
Cause I can sell my actual 980 Ti and by one Titan X wich cost 1600$ CAD.
I'm not thinking for the AMD solution cause we don't have any working solution yet and even more, the top amd cards are limited to 4gb vram due to HBM.