Mobo for multiple GPUs

[cray-zard]

i thought it will be twice as fast because of the cuda cores.. 1600 for the 970 and 2800 for the 980 ti, so its safe to say once i have my 2nd 980 ti it will 2x faster,

[auke]

You can't relate computational performance to the number of CUDA cores only, performance is dependent on alot more variables. I'd advise to check http://www.videocardbenchmark.net/high_end_gpus.html to get an impressions on different performances between GPU's (although even those numbers might not be representative to their performance in Vray.) In case you add a GPU identical to your first GPU it is safe to expect virtually safe the performance though.

[3LP]

just received my first 980 ti, i thought that from 970 to 980 ti the render time will be twice as fast, i think i just gained 30% speed coming from 970 to 980ti.

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have a look at this chart, it gives a good idea of what the cards are capable with Vray :
https://docs.google.com/spreadsheets...A0k/edit#gid=0