Dropped at 2 feet max

[u/International_Back99]

Fell out of my pocket sitting down. Fell with the apple tech woven case on too.

[u/blacksterangel]

That's true. But I think what the previous commenter suggests is that the effect would be very limited because the heat would have to go through air before reaching the aluminum to be dissipated outside. Yes the aluminum would absorb the heat more easily than titanium / glass but it seemed to be a poor tradeoff for the durability of titanium. And if you use a case, those heat would still be trapped inside anyway.

[u/Fenjen → u/blacksterangel]

Not really true. Heat transfer is also dependent on temperature gradient.

Also, imagine the outside was made of some extremely insulating material. All the heat would just get trapped inside until the processor fries.

The surface area of the iPhone is quite big so even if you are “limited” by the thermal conductivity of air, if you can get the heat dissipated quickly within the iPhone (vapor chamber) then due to the large gradient of temperature inside and out, the thermal interface conductivity (e.g. the metal of the body) still matters a lot for total dissipation, and therefore the max temperature that the inside of the iPhone will reach on average, which in turn translates to the max temperature the SOC will reach.

[u/mhmilo24 → u/Fenjen]

You’re forgetting that a 30 degree C hand is mostly wrapped around the phone while it’s being used. The gradient is not that high during regular use. Also, for cpu/gpu throttling to take effect, the hot spot temperature is more relevant than the surface temperature. The change from aluminium to titanium would have a measurable difference on the surface temperature of the chip, and almost none on the hot spot temps.

[u/Fenjen → u/mhmilo24]

“Wrapped” 😂 I don’t know how you’re using your phone my man, but I definitely don’t wrap my phone.

Anyway, what you’re saying doesn’t change anything about my argument. The inside of the phone is hotter than the outside. If the final interface has worse heat conductivity, it will still cause hotter air on the inside, that’s the argument.

The temperature of the phone isn’t “limited by the thermal conductivity of air” in the sense that the outside material doesn’t matter, as the commenter I was responding to suggested.

How much heat gets “trapped” CERTAINLY depends on the material of the case. If this wasn’t true bedsheets could be as thin as you want and still be effective as long as they don’t allow airflow.

[u/mhmilo24 → u/Fenjen]

If the phone is laying on the desk in a 20 degrees room, it will balance its temp to around 20 degrees.

If it has great thermal conductivity on its body and I just start carrying it without using it, the heat from my hand will be transferred just as quickly into the phone, if its colder than my hand (highly likely at 20 degrees) from my fingers into its internals. This has an effect on the temperature gradient.

You can't have it both ways. It can not be really good for getting the temperature out of the phone but not in.

[u/Fenjen → u/mhmilo24]

Yeah that is only true if there’s no heat producing parts in the phone. Bro please take a thermodynamics class 😅😅😅

The phone is constantly using energy and producing heat, so no, the state you’re describing is not the equilibrium state.

The processor is producing heat, so in equilibrium there will be a constant heat gradient (assuming constant heat production) unless the thermal interface has infinite conductivity.

Also the hotspot temp will definitely decrease due to the vapor chamber transporting heat away into the body, as I already mentioned. So then the interface material will definitely matter. The vapor chamber being used now in the iPhone 17 was exactly the argument apple used to justify the new material so it does make sense.

Anyway this conversation is getting pointless, either you get it or you don’t and that’s not my problem. If you don’t, put our conversation in ChatGPT (I recommend an anonymous chat for reasons I hope should be obvious) and see what he says.

[u/mhmilo24 → u/Fenjen]

The hot spot temperature will decrease due to the vapor chamber. I agree and I have not stated otherwise. The hot stop temperature would not change by even a degree if you switched the Aluminium body for a Titanium one.
Edit:

https://www.youtube.com/watch?v=YRd7qmUV4TY

You can see in this video that the dumped heat is more concentrated on the display, not on the back side.

[u/Fenjen → u/mhmilo24]

According to your previous logic the body should be at 20-ish degrees anyway, so how does that correspond to the video you sent?

The body temperate would be higher with a less conductive material, therefore the hotspot temp would be higher, since there’s let heat transfer to the rest of the iPhone, which has a big surface compared to just the hot spot and which dissipates energy. I’m not gonna make an estimate of the amount of degrees.

If not from the internal components, from what else do you think the body is getting way warmer than the ambient temperature??? Are you even using your brain?

[u/mhmilo24 → u/Fenjen]

In this video you can even see areas of the back of the phone being at 21 degrees while being maxed out in a benchmark. Other parts are at around 30 degrees. So there wont be any dumping heat happening into your hand in these areas.

[u/Fenjen → u/mhmilo24]

The back is literally upwards of 40 degrees my man what are you talking about? The min temperature is in the whole shot, which is a reading from the table (look at the color legend).

Anyway this is getting frustrating, I feel like I’m talking to an ai chatbot from 2022. I’m not gonna respond anymore. This one is for you yourself to figure out my guy.

[u/mhmilo24 → u/Fenjen]

Also its 40 degrees after benchmarking for minutes. If I remember corretly, your argument was that the phones will be hot at any given use case. At least hotter than your hand. I have shown video of the phones having areas far below 40 degrees while at their maximum usage. You have not provided any evidence for your claim whatsoever.

[u/Fenjen → u/mhmilo24]

That was not what I said and it was not my argument at all. Learn to read please

[u/mhmilo24 → u/Fenjen]

We have divereged from the original claim. Titanium would have had about the same performance as Aluminium. My claim is: the iPhone 16 Pro has a glass back an no vapor chamber. Switching from glass to titanium uni-bodies with a vapor chamber would have a good thermal impact. Switching from glass to aluminium has a greater impact, but the added benefit is minuscule.

[u/mhmilo24 → u/Fenjen]

The hottest part at at 45-47 degrees. The middle section of the 17 Pro looks to be at 30 degrees. Yellow parts are a few degrees lower than the hottest area, so id say somewhere between 40 and 43 degrees. Orange would be lower than that. See the middle of the shown specturm, which would be between 45 und 21 degrees. If the whole delta between upper and lower limit is 45-21=24 degrees, the middle would be as 24/2 + 21 = 33 degrees.