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But since that is hard to achieve i would say as close to room temp as possible. Everything else is really hardware specific. AMD cards for example run a bit higher than Nvidia.
From my experience 60°C is where you want to be at 100% load, with everything higher being a compromise between power consumption, heat and performance (you can adjust fan speed). At 90°C i would say you should stop. Not only because of the GPU but also because of the VRMs which might go up into flames from there on. And with a graphics card that runs a bit hotter it is also useful to keep an eye on VRM temp.
It starts slowing down at 50c and then will drop a but for about every 5c beyond that to its final drop around 83c, but by that time it has already dropped way below its maximum boost speed.
So, for pascal, technically for max performance you want sub 50c, however, to get there will not be cheap as you need to be under water.
The gain at sub 50 Vs 80c isn't that big in actual game performance anyway though, depending on the game it can be 5-10 FPS give or take.
EDIT: GTX 10 range begin throttleing at 83. The 1080 Ti throttles from 84
Sorry, but you are wrong.
It isn't throttling either, throttling is trying to save itself, I had a bad card that wouldn't hit 1600MHz because it throttled as it's temps went freaking crazy after 2 minutes of testing it hit 92c!
The maximum boost potential boost clock is only reached below 50c, there are a series of steps the card takes, it works out at about every 5c increase there will be a very small step down in maximum boost clock.
Given that you are still using a default fan profile that doesn't kick in until 60c I guess you know how the cards boost clock steps down better than me, this is something you will only really ever see with heavy over clocking under water at a minimum, and at its most extreme under LN2 where it's true maximum clocks can only be reached.
Gamers Nexus even covered this again a few days ago when they went to beat Linus tech tips 3dmark score.
Personally I see this when trying to benchmark, my cards will run at 2088MHz but once the temp approaches 50c they will drop down to 2076MHz.
As the tempaproaches 60c they will drop to 2067MHz, by 70c they are at 2050MHz give or take (pre water) at 80c they sit around 2025MHz (sli so the cards get warmer than a single card).
so, please do tell me of the dozens to hundreds of hours of testing you have done to come to the conclusion that the boost clock doesn't step itself back from its max potential until it hits the 80 degree range ?
The steps are not big, and unless you are heavily overclocking the cards you won't really even notice it.
If I had used liquid metal on my waterblocks along with better thermal pads than the stock ones from EK along with separating my GPU loop from my CPU and VRM loop, I could probably get the temps to drop another 3-5c and be able to maintain 2088MHz and see 2100MHz before it made its first drop as others in the top 100 can and have seen.
Edit.
If you go to MSI afterburner, click on the symbol next to the bar where you adjust your clocks you will open a new window, there you will see the steps it takes and can try to change them, the steps down are a mix of temperature voltage and clock speeds.
You're doing something wrong then cause it is what it is, 150w peak gpu shouldn't be hitting 72c.
Oh btw shove your rubbish I don't want it.
Edit.
Not sure why auto correct changed her to her lol