None.
I have the asus strix 1080ti and heat simply isn't an issue. My room gets hot as well, ambient temps can hit the mid 30C and while I haven't actually bothered to record exact temps I do have the lighting set to represent heat. I've never seen it go beyond green with a yellow tint. Which is around 60-65C. It's a very impressive cooler.
Ive literally never bought a reference GPU in my life
aftermarket all the way
Ok, so it reaches about 78-80c when playing playerunknown battleground, is that high? It's 100% gpu utilization.
nVidia's Spec Sheet for the FE cards lists the max temp as 91C, so that's when it will start throttling I think. The thermal shutdown point is at 105C I think. Generally, I am happy if my GPU stays at or below 80, though a 1080ti is a bit different than what i am used to, I think the general rule of 80-85 being max you hit under normal load is fine.
I may be crazy, but I actually think I prefer Nvidia reference cards over the aftermarket designs. My reference/FE 1080 Ti is noticably quieter than my EVGA 980 Ti AC FTW ever was, and despite the noise, the 980 Ti would still hit temperatures in the 80 C range - pretty much in line with what the reference cooler hits at the stock fan curve.
If I overclocked aggressively, I might feel differently, but I don't think there's a tremendous reason why you NEED to have your video card run below 80-85 C. It's got a 3 year warranty, and is engineered to run for something like 10 years at those default fan curve temperatures. The longevity really should be a non issue, and I have more faith that the base reference design is less likely to have significant flaws than specific aftermarket designs, just based on how much more widespread it is.
I also kind of like the design of pumping the video card heat directly out the back of the case vs blowing it around the case like the 2-3 fan aftermarket designs do. That should result in less hot air being blown over the rest of your components, a lower overall case temperature, and potentially less need for case cooling/less case fan related noise. I also think that aesthetically, the Nvidia reference card is the best and most classy looking card design on the market. In comparison, I think the Asus/MSI/Gigabyte 2 and 3 fan coolers look cheap and plasticy.
I always just leave cards on their stock fan curves. After all, if I'm not overclocking, I don't see any real purpose for a more aggressive fan curve and dealing with the inherent added noise when the warranty is surely built around the stock settings. My FE seems to peak at 85-86 C, but the fan speed doesn't go higher than 59% even at those temperatures, and it's virtually inaudible at that fan speed. With the EVGA 980 Ti, you could noticeably hear a drop in PC noise when you shut down a game and the fans started revving down.
I also wouldn't call it "not properly cooling it"; it's at stock settings, and the temperatures are within spec. They wouldn't have designed the stock fan curve to target the card sitting in the 82-86C range if they had any concerns about the longevity of the card, since they are the ones that have to deal with the expense of RMAs. I think people in general are more OCD about temperatures than they need to be. If a card is engineered to last at 100% load for 10 years, why even worry about it? It's going to be obsolete long before it "wears out" Even with the 3 year warranty, I don't remember the last time I've used the same video card for over 3 years; I always want an upgrade within 18 to 24 months.
I have the Zotac Gtx 1080ti Amp extreme edition with Overclock temp don't go above 66 C on air .