Scarlet-Tech
Are they sli? If so, you may need better case flow to get air to them.

DirtySouthWookie
its always best to space your SLI cards out and you wont have this problem.

DirtySouthWookie
hmm. If there is space, its an airflow issue. Try with the side panel off. If there's a big drop in temps, its an airflow thing.
If that doesn't do any good, use an aggressive fan profile. If you are overclocking (1500+1.2Xv) it will run warm even with an aggressive fan curve. I'd say you SHOULD expect temps in the high 70s MAYBE low 80s.
 
Those cards are meant to have the aircoolers ripped off and full WBs put on.
 You can do that and expect temps under 40c with most OC under 1.3v.

veganfanatic
i use the 300R chassis and I am hard pressed to get anything warmer than 70C in my box
 
I use Arctic MX-4 for repair of baked video cards, but my current card has a dual fan and it does not run warm at all even with a heavy load like Furmark etc
 
I have 2x 140mm fans on front which does wonders for inhaling cool air and I have 140mm fans on top to remove heat too
 
The rear fan is 120mm to allow for room for the IO shield but that fan is assisted by the top fans

Vlada011
Fabric clock on that cards is to high for air cooler.
They could work but you can't expect silence. Fan need to spin on 80% and you need really big case.
EVGA should write on box that recommend water cooling, just as their recommendation and customer to decide what they want.
Even if fan spin on 100% cards will be 75C in first 15-20 mins and than temps will continue to grow side of case will become warmer and warmer and 5 fans are not capable to remove hot air if two 100mm fans spin on 2500RPM with very hot air from them. 
If you put hands behind reference cards you need to move hand even on 75-80C because heat.
Much more heat come from non reference overclocked cards only you can't feel that but hot air stay in case and ambient temps start to grow fast.
Opened side panel is more efficient than 10 best case fans in same time. Case fans help to motherboard temps stay lower for few degrees, RAM to be cool, to cool down heatsinks but with graphic cards can't help at all. They spin on 1000-1500RPM,  fans on GPU spin on 2500+RPM and blow heat on all sides. 
 

Slushpup11
It's the two 140mm SP fans corsair makes. I think they move air just fine. The top ones are cougar and they move air good too.

Vlada011
I bought Twin Pack AF120 White LED and I'm surprised with silence and their performance, LED is nice as well.
They optimized him exactly for people who love silence. He spin on 1500RPM and I think on 1600RPM people will hear just little noise.
Now nothing. CORSAIR AF140 spin on little slower speed 1200RPM but surface is bigger. I have no place for them, and 1200RPM is to low for my taste.