I have a 1070 FTW and mine starts to down clock at a very early temp. I believe it's at about 50-52C it starts to down clock and continues further down like yours is doing. I've also noticed it's never gone past 100% power target either. It is said to increase the temp limit and make it priority in the OC software and it will wait to down clock at a higher temp but I didn't really see it improve. It still DC at about the same temps. So because of this I run my fans on 100% when I game or I'll easily lose almost a 100Mhz drop in no time. Sad but I think this is how many of the new EVGA cards operate, it's part of the new design in Pascal.

So I'm curious now, my old card would never downclock my old card would downclock, but much less often and it would maintain higher clock speeds, but eventually it would crash.

Also the slave bios on those cards will give you +130% power and always on fan curve.

Normal.

robin15243
However you can manipulate the downclocking with raising the temperature target. 
Pascal chips don't only check how hot they are running, they also check how far they are from the temperature target. 
 

Do you know if thermal throttling can be completely avoided with the given offset range of the temperature target slider alone ?

75MHz seems a bit excessive.  Mine drops about 13MHz (I know the steps are 12.5MHz, but you see 12 or 13 respectively) at 54°C, the same at around 62°C and then again around 70°C (though it almost never gets that high unless I try to get it to that).  That's 25 - 38MHz.  That's with the power target at 120%, so it only ever hits voltage limit.

   

Thanks for the info all, I'll mess around with it until I get something I like working.

AHowes
Hunt for jay2cents how to overclock pascal on youtube. A great how to using precision X oc.

I actually had to remove Precision X OC - it seems to cause major performance problems, I've noticed it in windows - i.e. running netflix on one monitor while working in the other, it is super choppy (this is with OSD off), and also in while running Unreal Editor 4 it destroys performance.  I'm using MSI afterburner instead, it works fine.
 
After doing a bunch of testing this weekend I discovered this card has something wrong with it. The downclocking gpu speed is definitely dropping way quicker and more values than on my original 1080.  Also, there's stuttering.  I first noticed it when playing Dues Ex, this one scene where the game drops down to ~60fps, there was some major stuttering - this did not happen on my original 1080 (I tested both) - I only get rare frametime spikes with my original 1080 - but on the old 1080 this scene was causing stuttering.  I tested it further in other games, Unigine Heaven - where it was very evident, and also tried overclocking the GPU and RAM to fix it - to no avail.  Ultimately, one of the best ways I found to test it was to load up Rocket League and just watch the News text scroll across the bottom of the screen - it was having jitters and inconsistent acceleration speeds / stuttering.  I put my original 1080 back into my PC, and noticed right away that everything ran as smooth as butter.  Basically the frametime jumps around like crazy on the replacement card, where my original 1080 keeps a pretty consistent frametime.
 
It's weird, because on paper they both score the same in Unigine Heaven benchmark.  But I could notice the stuttering while testing on the new card.
 
The crazy thing is, I put my original 1080 back in, that new nvidia driver came out, and I was gaming all weekend just fine - until tonight, where I again crashed in Rocket League.  I was playing a bunch of BF4, VR and other games without crash - so it seems to be happening less now - but it's still the same known issue, where crashes to black screen that doesn't recover - cards spin up to 100%.
 
Gonna have to talk to EVGA tomorrow.

Here's a direct example on how the temperature effects the clocks
this is me below 
h t t p : / / www.ozone3d.net/gpudb/scores-geeks3d-furmark.php?bid=2000
 
OpenGL renderer   Benchmark_name    Resolution    Score    Submited by                   Date
GeForce GTX 1080    FurMark (P2160)       3840x2160     7396      Anonymous (fan at 100)    Jun 9, 2017
GeForce GTX 1080    FurMark (P2160)       3840x2160     7149      Anonymous                       Jun 9, 2017
 
I think this sucks balls! I like the old way of overclocking better.
BTW, is the a modified bios one could flash? or any other hack available?