Thermal test of iPad's A5X chip shows operating temperature of 97 degrees F - Page 3

I think Soneria came up with that idea but his hypothesis ever once addressed why he doesnt think it's the GPU, the size of the chip, the RAM no longer a PoP, or why there is now a heat sink when before there was none. I'm not sure if he's being dishonest or if jut has blinders for displays but it's shortsighted no matter how you look at it.

One can test this, too, by playing IB2 at full brightness and lowest brightness to see to what degree the heat differs.

It isnt matter of belief. It's common knowledge that heat dissipation of a chip is directly proportional to its surface (look it up if you don't believe it).
So if you reduce the feature size from 45nm to - say - 22nm, the chip shrinks in its two dimensions and has a quarter of its original size, so it dissipates four times less. You can calculate the 45nm versus 32nm case for yourself (it should be around 2.8).
11nm isn't available yet, your right about that.
But I reacted on the assertion that 45nm versus 32nm wouldn't make much of a difference.
And that isn't true.
Samsung and others are able to make SoCs with a feature size of 32nm even 22nm if you look at memory chips.
So it isn't that strange to make the comparison.

J.

There's tons of ways of rationalising an issue away, the CPU of the new iPad is apparently getting warmer and warming the iPad more due to its increased demands and the 45nm manufacturing process, that's the most sound conclusion and the most obvious one. Is an iPad not charging while plugged also some shady ploy by cr or ny times against apple? Come on boys, apple wanted to be first in the market with retina display and they are taking a hit with heat issues and charging issues because of the incremental update of the CPU and the added gfx cores on an already very high by today's standards manufacturing process. Apple are to be commended for pushing mainstream tech with retina, but as a rev.1 high tech product the new iPad has its issues apparently.

The iPad doesn't have an "issue" with "not charging while it's plugged in" in general, just when its being used at the most power consuming level possible. So that's only an "issue" if you go way out of your way.

And what about any of this is "rationalizing"? More power hungry parts, gets slightly warmer. The end.

Oh and I thought it had an issue with charging when plugged in, in general, and I was asking myself how do they manage to keep the power without it ever charging when plugged in, some pretty amazing a engineering there...

Yeah I guess we shouldn't go out of our way then and use power consuming apps, and we should also be checking -how we ll figure it out- which apps are power hungry so we can have our iPads charge too... Boy I'd love to be in aline of work with a critical element to ot, say a pilot and have my iPad plugged and running a demanding app only to see it drain away and not charge.

What a load of horse manure, the level of talk from some of you guys here are making this site, which is otherwise great in the level of posting by most people, unbearable, ignore list ASAP for me.

I love the way people fall back on 'common knowledge'.

Please show some evidence that a die shrink from 45 nm to 32 nm would reduce the power usage by 2/3.

In reality, a die shrink does reduce power usage somewhat, but nowhere near a 2/3 reduction. Have a look at comparable chips with different line widths:

http://en.wikipedia.org/wiki/List_of...er_dissipation

The post you quoted is not incorrect. It is simply discussing a different type of statistic. You're referring to the percentage increase in heat generated in use compared to the previous model. The other poster is referring to measuring the actual heat at peak.

The statistic you're using can be very misleading and lead to headlines like "New iPad gets twice as hot as iPad 2".

The other statistic shows that, regardless of starting temperature, the new iPad runs only a few percentage points hotter than the iPad 2. At the end if the day, isn't that more in line with reality?

As the old adage goes, there's lies, damn lies, and statistics.

A lot of these discussions really do illustrate that even simple physics is a moderately complicated subject, and that just failing to appreciate the difference between steady and unsteady heat flow is enough to derail an argument completely.

The simplest analyses are often the best, and in this case, it doesn't get much simpler than the observation that the energy content of the new iPad's battery is nearly twice that of the old one, but that it's nominal battery life is the same. That does indeed mean nearly twice the power dissipation, and since virtually all of that energy is dissipated as heat (I'm ignoring emitted light and sound here), and since all heat loss mechanisms depend in some way on differential temperature (relative to the environment), the device, if otherwise physically similar, must run hotter.

How much hotter depends on the environment, and since the primary cooling mechanisms are going to be conduction and convection, it will be sensitive to factors affecting those processes. I doubt the various tests are controlling those very tightly.

I do not have a problem with my ipad 3. I like your comment about getting the heat out My only concern is what kind of cover would be the best if someone is concerned with the heat. I used a leather type cover.
Another thing is if there is an app to monitor temp?

The best cover would be something like the SmartCover - since the heat is mostly dissipated through the back of the iPad. You don't want a cover that covers the metal part.

First of all, I am not 'people'. Second I will rephrase my statement: to the best of my knowledge chip dissipation is directly proportional to its surface area (*). I thought that was common knowledge like Moorse law or the qwadratic surface area to speed relation for wind resistance and the frequency doubling when the feature size of a chip shrinks to half and so on.
It could be that I am mistaken about the common knowledge, you don't seem to have it you claim.
I know the chip industry for about 40 years and have seen the trends, and that's the source of my knowledge.
Further, your wiki link is a disputed article and not in any way clear about dissipation. And most important of all it doesn't have information about the most relevant processor in this discussion: the ARM processor. So you have to come up with something better.

J.

(*) take care that I stated that the frequency of the cores and the number of cores (and so on) must be the same for a correct compare between chips. Note that most of the time feature size shrinks and the frequency and transistor count increases (this is also common knowledge), so you have to account for that when you compare actual chips.

Your statement is wrong - even after you rephrased it.

The A5 and A5x are not the same processor. There are twice as many graphics cores in the A5X.

Saying that heat dissipation is proportional to chip area is meaningless when you're comparing different chips.

Reread my posts.

J.

Yes, you're probably right. If only more people on these boards simply jumped on whatever grindingly predictable Apple "scandal" happens to be consuming the insect like attention span of teh internet these last 5 minutes or so we could have much more productive conversations. I, too, long for the days when this board was largely comprised of grimly enumerating all the ways Apple sucks. Good times.

Only a raving fanboy would assume that making a big deal over slightly warmer case temperatures when the device is being driven flat out isn't a huge issue that needs to be dissected ad infinitum.

I think we can safely assume that any charge against Apple, no matter how slight or unfounded, must be given the utmost attention, because "fanboys" will protest.

Really, have you read some the of the posts around here, the iPad can be spitting out fire from the speaker grill and the, "fanboys" will find every excuse to down play it as much as possible.

The iPad does get a little on the warm side, especially if you play a game that is heavy on the graphics, I happen to like Shadowgun and Sims 3. I've been using my iPad extensively this past week because I'm stuck in a hospital bed for foreseeable future and I find my self shutting down the iPad between 2 - 3 times a day because it becomes a little to uncomfortable to hold.

It's not horrible in any sense but I'm also afraid of melting something, it's a new machine. Like I said though I have been using it more then a average person would, do to my situation. I would imagine that most people would probably never get it to the point where they feel they need to shut it down to cool off.

Tell you what: let's say we wait till Apple ships a product that actually has a problem comparable to spitting fire from the speaker grill, and if anyone defends that I'll join you in being dismayed.

As it stands, we have a long sorry history of ginned up "gates" that don't amount to much but for their moment in the sun are brandished as proof that fanboys think Apple can do no wrong.

Myself? I see way more evidence that some people will seize on pretty much anything to portray Apple as coming up short, than I do evidence of these crazed, never-say-die fanboys. Just in general, if you find that kind of thing off-putting, maybe an Apple enthusiast site isn't the best place to hang out? The internet is full of tech sites where being an Apple fan is like declaring yourself a child molester.

Oh come off it, I'm not taking any chances, My iPad hasn't been turned off more then 20 minutes since I got it last Thursday, I've played games on it for like 4 hours not stop and there were times I had to prop it up on pillows because it was to uncomfortable to hold. So excuse me if I'm just a little concerned about my new toy. I don't want to be in a situation where I won't have it while I'm in the hospital. It's bad enough I'm fighting this horrible affliction it would be even worse If I didn't have my iPad with me while doing it, your kind of a mean spirited sometimes SolipsismX, oh look those kids are back on you lawn again.

I just stupid comments. Saying you're afraid it's going to melt because it's warm to the touch is obnoxious. You sound like a troll who you is claiming they have Apple products so they can keep trying to point out how flawed it is.

I've been using notebooks for about 15 years now. At times they get uncomfortably warm when sitting on my lap. Never once have I stated that I choose not to use them because I'm afraid of it melting.

If you aren't trolling and actually think it could melt then replace it because melting is a clear sign that it's a defect. It's also a safety hazard.

Yea your probably right, Appleinsider has become more of a bitch session as of late. Here we have a new Apple toy to play with and the only threads under the iPad part are all negative. I get caught up into to, it's kind of hard not to when there is nothing else happening. Everytime I start a new thread that asks what new things people are doing no one replys and it dies faster then when it was started. I need to find an Apple site where they just discuss how to be more creative with their tablets. Something like XDA but just for Apple would be cool, oh www.hackint0sh.org , I completely forgot about them, their a fun bunch.

You might be interested to learn that this forum was quite a bit more like you're describing a few years ago, and that there has been a decline in the quality of discussion that corresponds to the rise of iOS. That is, we get a lot of posters who aren't particularly "Mac people", or people who aren't at all and seem to take offense that such exist.

You can understand that vehemence in defense of the platform is directly proportional to the intensity and frequency of attacks. If the general vibe is "Apple enthusiast" and there isn't a constant drumbeat of "stupid fanboys must die", it's a lot easier to have a relaxed conversation about shortcomings and stuff we wish Apple would or would not do.

Over the years, members have been pissed off about the Finder, the early state of OS X, machines Apple refused to make (notably the fabled xMac), the ever swelling role of iTunes, Apple's seeming determination to break all their video software, the Great Matte Screen debate, etc. etc.

Many of the membership best equipped to make articulate critiques of Apple's missteps, real or perceived, have moved on, and understandably so. Who wants to talk about stuff you wish Apple would or would not do when the forums are full of people snickering about how Apple users are idiots?

Sorry, but you're not a very reliable witness. Aside from the fact that your posts are full of unending fact-free Apple bashing, you claims in another thread that you could hold the iPad 2 (1.34 pounds) for long periods of time without fatigue but the iPad 3 (1.46 pounds) is just too heavy for you to comfortably hold.

Sorry, I don't believe a word of it.


So you'll play the reverse ad-hominem card. We're supposed to respect and honor your silly Apple bashing because you've been sick? Sorry, it doesn't work that way.

The only time I go off on the iPad, is in response to people bashing my choice to own a Android tablet or when individuals take their iPad way to seriously. I just don't come out of the blue and say Apple sucks Android rules. No it has always been in a reply to someone who obviously had never used such a device, then others jump in so I have to continue to protect my choices, then you always seem to show up at the end and further crap in my pot by labeling me a liar and Apple hater. It is you who is the problem here Mr. not me.

If you've recalled any of my other posts you would also know that I own more Apple products then, I would dare say 80% of you that reside on this board. I haven't been hanging around Macbook, Apple TV, Mac Mini, iMac, OSX, forums lately because if you kind of noticed I am on Mobile kick right now.

If I didn't like the damn products I wouldn't have bought them nor would I be here right now putting up with you. What's infuriating though is most of you say your tired of all this Apple bashing but then that's all that ever happens around here.

Now I'm sorry if I get a little to pro Android or any other mark beside Apple, it's because I'm a huge buff of all things tech, especially mobile. I would love it if Apple made the perfect mobile device then it would save me thousands of dollars in searching for that holy grail.

Now this is a thread about the heat issue, I don't know if it's much of an issue and in my posts I've said just that. The iPad does get a little uncomfortable because I have been playing with it the entire day. I also said I don't care and I wouldn't give it up for the older model, the speed and awesome monitor more then makes up or it. The weight thing, "I don't think I can believe what your saying", screw you, is it not heavier, is it not thicker. Yes, I can no longer hold it with one hand for as long as I was able to hold the iPad 2, fact, you can't call me a lier when it's my own damn body. Those extra grams did make a difference and I am not the only one apparently as their is a thread about that here and every other Apple site that I have been to including Apples own forums. Though I've been spending a lot of time on the internet these past few days I didn't start those threads no but me I'm the lier. Again though I said I don't care as the good out ways the bad. I'm just participating in a discussion as there seems to be no thread at the moment about how incredible the new iPad is, there just all negative.

What is it with these personal attacks anyway, you don't know me and if you did I know you would be ashamed of your self right now. Read this very carefully, it's a f*cken computer, a inanimate object, no pulse sold by a company that would rather see you dead then to acknowledge your existence, you are nothing but a statistic on their bottom line.

Stop being so mean and full of yourself, I get it Apple can do no wrong. I'm moving on.