I get where you're coming from with that logic of more fans = more airflow, but it seems to me from the reviews I've seen, it's not as significant as it should be.
You could even argue that under load, the triple fan design would be louder because that's more fans @ 100% rpm. I can see the triple fan would run at lower rpms when the load is not as high and at the lower temperature ranges. But once it reaches a certain temperature, the triple fan setup would be louder.
What I'm trying to say is, pushing OC beyond the numbers you're typically going to get with a dual fan cooler, you should really be going liquid. Going triple fan air cooling is a bit overkill.
You can read all about the performance of that card in the article. Neat read though. Not like it matters now that the 1080's released.
http://www.overclockers.com/evga-gtx-980-ti-classified-graphics-card-review/
To put it into perspective, here's Asus' triple fan GTX 980 Ti STRIX DCIII OC
http://www.hardocp.com/article/2015/09/01/asus_gtx_980_ti_strix_dciii_oc_video_card_review/1
The OC that they managed with that card is on par with eVGA's classified and the temperatures they were getting is very similar. (The Classified was around 5 degrees hotter than the Asus one)
tl:dr The triple fan design vs dual fan design isn't all that different.