I may look like the ultimate troll for saying this, but this topic has been around since the iMac 5K came out and a gazillion posts later I don't understand what all of you trying to prove, disprove or achieve. I'm genuinely curious. All I can see is "it runs hotter than 100 degrees, it throttles" and that sentence is repeated, like, 1000 times with some occasional graphs detailing throttling. And after 40+ pages of this, I have to ask, erm, why are you continuing to discuss this?
Here, I'll just wrap this up for you:
1. Yes, the M295X runs hot and it's probably designed that way. Laptop components get hotter then desktop ones. Unless you run, like, Crysis 24/7 for six months straight, it will be fine.
2. Yes, both the GPU and CPU will throttle. They probably throttle less than the base model, but even then, they are faster.
3. You're not judging this iMac for what it is, but for what you want it to be.
4. Apple must've had a reason to go with AMD for this model. Even if it was 'just the price' - that is possibly a good enough reason. If they couldn't make this model for cost X, perhaps we wouldn't even see an iMac 5K this year. Or the next.
5. Comparing this year's model to the 2012 or 2013 iMac is wrong. It is faster (for most things) and it's screen has 4x as many pixels. It is also louder and warmer. If you want to compare the heat and noise, also compare the other specs.
I mean.... and I know a lot of people will hate me for this post but.... aren't you being a little bit overdramatic? Just asking. I mean, you have this marvel of engineering in your hands and you bitc.... complain because it's hot and you can sometimes hear the fan? I don't get it. But then again, I'm aware this is just my opinion. You guys and gals have every right to disagree.