DukeCLR
I had the order wrong, I edited my post above.

foolycooly100
I'll add my experience with temps on my SC2 here.  Some basic testing led me to a core offset of +70 and a memory offset of +300 (core was my biggest issue...I think I may be able to push memory further but don't have any interest to). With my custom curve, I have the fans ramping up to 65% at 70c and then increasing to 80% at 80c.  I haven't seen 80c yet at this configuration and my core clock settles in anywhere from 1949 to 1966 in games and my temps settle around 74-75c.  Fan RPMs in XOC show about 2600rpm which appears to be close to the 65% i set at. 
 
I'm a little disappointed in these temps after reading reviews/users showing temps in the 60s during benchmarks, but I think most of the time people are running fans at or close to 100%.  100% is just way too loud to me.  even 65% seems louder than I'm used to with my 780 ti SC, but it's not obnoxious.

Those temperatures are very similar to mine. Do you have Mass Effect: Andromeda? If so what temperatures do you see during that game? My SC2 can hit 78 C during cutscenes but seems to run 75 C or less during the game. I played the game for 10 hours on Monday and, thankfully, it never went above 78 C. However, 78 C is only 6 C off the Founder's Edition threshold temperature of 84 C so I can help but feel underwhelmed that my card was hitting 78 C in game that was even capped at 60 fps (as I use v-sync on a 60 Hz display). Sure, it was running at 1,987-2,000 MHz almost the entire time I played the game (and with +500 MHz on the VRAM) so maybe the Ti chip just runs hot when overclocked? I haven't tried a custom fan profile yet though, mainly because I still prefer to use MSI Afterburner over Precision XOC and that doesn't have dual fan control. 

I think the default fan profile at the card's stock clock speeds is fine from my brief testing.
 
It looks like overclocking needs a custom fan profile, something that I never had to do on my GTX 1080 FTW as the temperatures even with the card running at 2,038 MHz on the core and 11.8 GHz on the VRAM were 72 C or less (most games didn't even reach 70 C). I guess those temperatures are the reason for me being a bit underwhelmed with the ones on the 1080 Ti SC2. The Ti is clearly a hotter running chip and the improved iCX cooling and shroud design doesn't seem to be able to cope as well as the GTX 1080 FTW when it is heavily overclocked.
 
I'm going to have a play around with a custom fan profile over the weekend but I'm not exactly thrilled at having to use EVGA Precision XOC in order to access the functionality of the SC2, including dual fan speed control, as (IMO) the software is not as user-friendly or as well designed as MSI's own Afterburner. Does anyone know if creating a custom fan profile in Afterburner forces it for both fans on the SC2 or does it only apply it to the GPU fan (i.e. it leaves the Power fan at automatic control)? If it's the former then I can stick with Afterburner for custom fan control as I would rather have both fans running at the same speed anyway.

what kind of cases and airflow u have its important, all benches done by reviewers are done on bench open table. for example a week ago sold 980 ti sc maxs temps were 65-67 who brought it has 75-77

I upgraded from a 25" Dell U2515H to a 27" ASUS ROG Swift PG279Q monitor a couple of weeks ago and have been impressed with G-SYNC particularly, which allows me to play all games above 60 fps without screen tearing after all these years of being stuck with 60 Hz and v-sync.
 
However, I have noticed that the warmer spell here in the UK, which started last week, has resulted in the GPU temperature reaching as high as 86 C during WRC 6 on Saturday while playing at 4K and 90-100 fps. Of course, higher temperatures are to be expected as the GPU is doing more work but I wasn't expecting to see it get that hot (case air flow is pretty good IMO with the CPU stating below 60 C and the motherboard below 35 C). I did not see anything above that though; the GPU speed starts to drop to compensate as the fans hit 75-85% speed.
 
Of course, the card is designed to run that hot and it is overclocked too but I wasn't quite prepared to see it running at reference/Founder's Edition temperatures. Still, I feel uncomfortable letting the GPU run that hot for extended periods so I may tweak a profile to target a lower maximum temperature of, say, 80 C. Either that or cap my games to 60 fps!

My findings are the SC2 cooler is slightly underwhelming in a large Cooler Master HAF X case with very decent cooling,  and the CPU in a closed cooling loop. 
 
+85 GPU OC
+275 Ram OC
- Custom Fan curve
-22C ambient ish room temp
 
It will hold 2025 ish GPU for a while and settle usually around 1974. At around 1974/66C GPU the fans are about 2100RPM with my custom curve which makes it definitely audible and the largest noise from the case. I can comfortably state this is a slightly louder card than my now sold GTX 1070 FTW at max OC.
 
For me living in Australia the SC2 was well worth buying, the SC2 squeezed in JUST under AU$1000 meaning I could avoid sales tax when buying from the US, so effectively I saved around AU$180 over buying this or any other AIB card worth having locally.
 
If I lived elsewhere and there was only US$30 difference over other options, I honestly could not recommend the SC2 unless space is a major issue requiring a 2 slot cooler. I still rate the SC2 better than the Founders and still a very good card, but its on the lower end of the AIB cards.