Due to the lack of information available regarding the VRMs on the non-FTW cards I decided to test this myself on my eVGA 1070 SC black edition. This image is obviously much less accurate than whatever the review sites put out. I used a FLIR ONE (~$250, clips onto iOS devices to take low res thermal images), ran GTA V for 5 minutes, and then stuck my FLIR ONE into my case for this quick photo.
 
Will let you guys debate the results. If anyone has the ability to do the same for a backplate card, I'd be curious to see how the presence of a backplate affects temperatures.
 

I took the backplate off of my 1080 ACX 3.0 card to put it under an AIO cooler with a G10 bracket (no heatsinks or thermal pads! NONE). The front AND back plates had to be removed to fit the AIO and bracket on.
 
I used a wireless IR gun to test each of the VRMs front and back while looping Valley at 2202MHz and power and voltage maxed (volts read 1.062 in software fwiw). The back posts of the VRMs  (the solder joints that stick out the back of the PCB) all read about 60C. The front of the VRMs all read about 40C. Just a dinky little Kraken G10 fan blowing on them, and two big (and slow) 220mm fans blowing in from the case's side over the back of the card.
 
Not sure if that means the backplate is trapping all that heat on your card, or if your case doesn't have very good airflow. What I can say is that my 1080 ACX 3.0 (same PCB as the SC and founders) does NOT have that hostspot.

Good call on the airflow, I turned the fans on my case to max and the "hotspot" dropped to about 80C.  More tellingly, it's also not so much a hotspot anymore, the airflow blowing parallel to the card is spreading it across the whole PCB surface which I assume is a good thing.  

I have 2 front intake fans and one rear and one top fan so I have good air flow, so nothing gets a chance to get warm
 
i have seen video cards overheat in the past so I made sure the chassis i have now can handle it
 

It would be cool to get an official statement on the black edition from EVGA since, we cannot order the thermal pad, the whole situation is scaring me a little bit. Is it just because the black-edition is cheaper than the others hence less support ? or is the lack of backplate really that affect the VRM temperature ?

EVGA supports all SKU within the warranty period
 
if the card/PSU fail they will replace it
 

_inkubux_
It would be cool to get an official statement on the black edition from EVGA since, we cannot order the thermal pad, the whole situation is scaring me a little bit. Is it just because the black-edition is cheaper than the others hence less support ? or is the lack of backplate really that affect the VRM temperature ?

I have't pulled mine apart yet, but from reviews the backplate for the 1070 is essentially for protection, rigidity and aesthetic appearances only. There is nothing on the backside of the GPU or thermal pads to allow any heat to be transferred. It actually has small standoffs to keep the backplate away from the components. The only way heat can be transferred is via heat radiating off the pcb or through the standoffs.

 
Here's an image showing results with more airflow.  Not too shabby, right?  

I suggest using lots of fans like said ^ and make sure all fans are clean and free to operate
Cards with higher power requirements need higher cooling
 

The GTX 1070 shouldn't really be considered a high power requirement card.  It's a little bit irritating that I have to "baby" what should be a cool and quiet card (150W TDP, if i remember correctly) relative to its predecessors.  150W TDP would make this the coolest card I've had in a long, long time (have had GTX 260, 470, 760).  
 
While (some) people are certainly over-exaggerating their problems, it seems clear the ACX cooler is worse than its peers (even if the temps are technically within spec).