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iPhone 15: users of Pro and Pro Max models complain of overheating issues

theguardian.com

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Re: iPhone 15: users of Pro and Pro Max models complain of overheating issues

#41

Post by hombre_fatal »

appleskeptic wrote: post #30
woah wrote: post #26

Why is weight even a concern? Thinness I get because that makes a real difference in your pocket, but what's the point of reducing the weight a tiny bit?

To be fair, some ways of holding the weight of the phone in one hand, e.g. resting the weight on your pinky finger along bottom edge, can cause hand injury/RSI. So weight isn’t a totally solved problem.

Does this actually cause hand injury? The bent-pinky-finger social media panic was easily defeated by realizing both of your pinkies, not just the one that holds your phone, have the same bend: it’s a knuckle.

Re: iPhone 15: users of Pro and Pro Max models complain of overheating issues

#42

Post by concinds »

scblock wrote: post #27
A_D_E_P_T wrote: post #21

I can't say to what extent this is a real problem, but I can note that titanium has exceptionally poor thermal conductivity. Ti 6-4: 6.7 W/(m·K) Stainless steel (18-8): ~16.5 W/(m·K) Aluminum 6061-T6: >150 W/(m·K) As engineering alloys go, in general, titanium is at the bottom of the pack for thermal conductivity. It's possible that this might make the body of the phone a poor heatsink and lead to localized hot spots…

This is irrelevant since the majority of the internal frame is aluminum. It's really just the outer portion that you hold that is titanium.

Since titanium covers the whole back and sides, wouldn't it act as a "thermal bottleneck" regardless of the aluminum?

Re: iPhone 15: users of Pro and Pro Max models complain of overheating issues

#43

Post by lloeki »

capableweb wrote: post #36
bogantech wrote: post #14

Earlier quoted context omitted.

Normies care about the fact that it's uncomfortably warm to hold, not whether the CPU is hot or not.

I do think "normies" care about the CPU is hot or not, but they do so indirectly, as the phone will start throttling the CPU when it reaches a certain temperature, so the phone will start feeling laggy. If you've ever tried to play a game on the iPhone/doing something else CPU/GPU heavy while outside in the sun on a hot day, you'll know what I mean, the performance is much worse.

> while outside in the sun on a hot day, you'll know what I mean, the performance is much worse.

Once I've had it outright shut down and show a black screen with a pretty thermometer, how's that for "performance is much worse"? ;)

(to be fair it was a spectacularly hot and sunny day, definitely in the "out of spec" range)

Re: iPhone 15: users of Pro and Pro Max models complain of overheating issues

#44

Post by oflannabhra »

tiffanyh wrote: post #37

Thermal Conductivity I wonder if this is related to the use of Titanium and the poor thermal conductivity of Titanium (17 W/m-K) vs. Aluminum (210 W/m-K). Aluminum dissipates heat more than 10x better than titanium. https://waykenrm.com/blogs/titanium-vs-aluminum/#:~:text=All... . --- EDIT: I no longer think it's thermal conductivity due to the change in metals. See below. https://news.ycombinator.com/item?id=3770515…

The amount of titanium in the iPhone is about a 1-2mm band around the outside. The inner chassis is still aluminum, and they are diffusion bonded together. While that Ti is at the primary thermal boundary for the metals in the phone, I would guess (judging from experience with both stainless steel and titanium banded phones) that most heat escapes through the glass front and back of the phone, even though they have poor conductivity.

Re: iPhone 15: users of Pro and Pro Max models complain of overheating issues

#45

Post by appleskeptic »

hombre_fatal wrote: post #41
appleskeptic wrote: post #30

Earlier quoted context omitted.

To be fair, some ways of holding the weight of the phone in one hand, e.g. resting the weight on your pinky finger along bottom edge, can cause hand injury/RSI. So weight isn’t a totally solved problem.

Does this actually cause hand injury? The bent-pinky-finger social media panic was easily defeated by realizing both of your pinkies, not just the one that holds your phone, have the same bend: it’s a knuckle.

Not the bend. Just that it hurts if you hold it like that for too long :(

Re: iPhone 15: users of Pro and Pro Max models complain of overheating issues

#46

Post by yellow_lead »

tiffanyh wrote: post #37

Thermal Conductivity I wonder if this is related to the use of Titanium and the poor thermal conductivity of Titanium (17 W/m-K) vs. Aluminum (210 W/m-K). Aluminum dissipates heat more than 10x better than titanium. https://waykenrm.com/blogs/titanium-vs-aluminum/#:~:text=All... . --- EDIT: I no longer think it's thermal conductivity due to the change in metals. See below. https://news.ycombinator.com/item?id=3770515…

> Ming-Chi Kuo, an Apple analyst at TF International Securities, said any overheating issue was probably due to “compromises” in the phone’s design as the company attempted to reduce the product’s weight.

> The iPhone Pro model has a frame made from titanium, a poor conductor of heat, which could hamper the handset’s ability to disperse heat. Previously, Apple has used stainless steel for its high-end phones.

Re: iPhone 15: users of Pro and Pro Max models complain of overheating issues

#47

Post by oflannabhra »

haswell wrote: post #20

I wonder how much of this is just caused by the higher workloads people put on their new phones just after purchase: restoring from backup, installing/trying new apps, testing out that new GPU, Photos doing a new classification pass on the existing library, and just a generally higher than average workload for the first few weeks of ownership. It seems like there are always a flurry of reports of issues like this on…

I think it is likely this is a major cause of the issues, or at the very least is influencing the prevalence of them.

Re: iPhone 15: users of Pro and Pro Max models complain of overheating issues

#48

Post by alt227 »

woah wrote: post #26

Why is weight even a concern? Thinness I get because that makes a real difference in your pocket, but what's the point of reducing the weight a tiny bit?

You must have very thin pockets! In mine the difference between 8mm and 9mm is undetectable.

Re: iPhone 15: users of Pro and Pro Max models complain of overheating issues

#49

Post by nfriedly »

secretsatan wrote: post #8

I have a 15 pro here for testing, it was fine yesterday, or maybe I just didn't notice it because i wasn't handling it so much, but today, it is very warm (After being idle for 30 mins, not plugged in or anything). Also, the framerate on our AR app is worse, XCode debugging navigator isn't telling me the fps, but compared to a 12 pro, it is noticeably jittery

I've had that experience with some of my testing devices. For the jailbroken one, I can SSH in and see what's happening, and I recall that in at least one case it was an apple process that was sitting at 100% (I think it was springboard, but it's been a while). I killed it and it restarted automatically at a more reasonable 0-3% CPU load.

For the non-jailbroken devices, I just reboot them if I notice something is off.

Re: iPhone 15: users of Pro and Pro Max models complain of overheating issues

#50

Post by mmanfrin »

woah wrote: post #26

Why is weight even a concern? Thinness I get because that makes a real difference in your pocket, but what's the point of reducing the weight a tiny bit?

Some of us wear lighter clothing. I've noticed my phone actively pulling down my gym shorts.
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