One iPhone thread to rule them all -- post all iPhone discussions here. - Page 27 - TigerDroppings.com

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VABuckeye
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re: One iPhone thread to rule them all -- post all iPhone discussions here.


I haven't had a glance to use maps yet.

Damn, this phone is light.






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simbo
Member since Jun 2011
1664 posts

re: One iPhone thread to rule them all -- post all iPhone discussions here.


I got mine yesterday and that's basically my assessment.....very light and very fast. Battery life seems very good but I've just been really surpised at how fast LTE is and just moving between apps. Like instant movement.





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Dijkstra
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re: One iPhone thread to rule them all -- post all iPhone discussions here.


quote:

Battery life seems very good


WARNING: TL;DR INCOMING
This is intended to put an explanation and "face" to the problems iPhone 5 users are facing. It also serves to compare the iPhone 4, 4S, and 5 from a comparative power consumption standpoint to explain the noticeable differences. The numbers and figures are not guaranteed to be 100% accurate, and I'm sure you'll find an error or a miscalculated capacitive load. Just trying to put minds at ease and give you a face to your battery life's enemy. Feel free to ignore all of this and enjoy your life. - Edsger Wybe PirateZac Dijkstra

The battery is actually much better, but the draw of LTE kills battery life much quicker. Also, the change in processor power (single to dual core)changes things when comparing the 4 to the 4S/5, as well, which is why we've seen outrage in both releases. I actually figured these out the other day to get an accurate measurement. I found the capacitive load (CL) myself, but it may be off a little Also, this only takes into account serialized instructions, and it does not account for multiple threads or parallelized instructions.

NOTE: nF(nanoFarads) = 1.0e-9 F

iPhone 5: 3.8V, 1440 mAh, 1.2 GHz(Dual)
CL: approx. .31452 nF (3.1452e-10F)

iPhone 4S: 3.7V, 1430 mAh, 1.0 GHz(Dual)
CL: approx. .3835 nF (3.835e-10F)

iPhone 4: 3.7V, 1420 mAh, 1.0 GHz(Single)
CL: approx. .38714 nF (3.8714e-10)

So, as we can see, the capacitive load is a bit less, and the voltage and the mAh are higher in the iPhone 5. The iPhone 4S actually looks to be be only marginally better than the iPhone 4, but what sticks out is a jump in battery life while making the switch to a dual core processor. This is one of the reasons their overall capactive load is so similar. When taking this into account, the clock speed is treated as handling serialized instructions at the max speed and voltage that they can handle. Because the 4S has a similar voltage and marginally higher mAh, it has a similar battery performance because the two cores are not taken into account so of course in theory, they should have had a similar battery life, right?

The problem is that we DO have two cores, and we have to acknowledge the trade offs of that. On one hand, if a portion of the instructions are parallelized, we can process two streams simultaneously to cut down on time spent processing those portions. That seems great, but we have two issues. The first is that not all instructions will always be parallelized so some of them must be run serialized, only utilizing one core. The second is that with the usage of a second core, we up the usage is power during that period. While dual-core may be more efficient in some cases, there are a ton where it consumes more power. So even though we spend less time processing instructions, we still have to deal with serialized instructions and also the case in which the dual-core sucks up more juice. There are also other factors that play into it, but that plays a factor in the 4S having a seemingly much worse battery life than the 4, even though they have similar battery specs.

Now, we move up to the iPhone 5. It's got much less of a capactive load, which is largely due to the use of the new Tri-Gate transistor, also called 3D transistors, technology that allows vertical transistors. This allows them to pack more transistors than they could traditional transistors into a similarly sized area, and they operate at lower voltages with less leakage. This should mean the battery should last much longer than its predecessors, right? Not quite. The problem is that the iPhone 5 has a much better power specs because it needs them for what they've added.

First, we have the A6 chip. It's got two-cores with a clock speed, from what I've seen, of around 1.2GHz. Obviously, this requires more power to operate, and with an mAh rating not much higher, that'll be an issue. The second major factor is the inclusion of LTE. In an AT&T test, the energy drain is proven to be higher for LTE. With 3G, the power drain is static. It's always going to be the same. With LTE, the drain is heavily dependent on the size of what's being transmitted. LTE has two DRX states for data transmission. When data is received, it goes into the short DRX state which consumes high power while receiving it, which is why we get mobile porn much faster on LTE.

The issue isn't with that, but instead, the problem lies in the with behavior of the long DRX state. The radio switches to the long DRX state, its tail state, after data is received and waits for more while remaining in high power mode. If it gets more, it loops into the cycle. Otherwise, it waits for a certain period before going idle again. This is where the big hit happens. You're no longer receiving anything or doing any tasks, but LTE is sitting in the long DRX state waiting for something else before switching off. Because 3G's consumption is static and its tail state is always in half power mode, it consumes less power.

The final numbers in the test had 3G consuming 34.67 J while LTE consumed 45.16 J. That means it consumed 30.2567% more energy than 3G for the test. That's a sizable difference, regardless of the fact that it could use less power at some points. Another factor that ties into that is that most of the people with iPhone 5's right now are using the shite out of them. It's a new, fast, fancy phone, and, of course, you're going to want to flex its muscles. This means you're probable also sending and receiving a lot of data, which in turn means you're using a frickton of LTE transmission. This would explain why the battery seems to be crying itself to sleep at night. I wouldn't worry about it too much, though.

Eventually, when your phone usage returns to normal "I've already played Doodle Jump a million times, and I just want to use my phone to text, call people, and occasionally, Google something to prove to someone that you're right and they're wrong" mode, you'll be alright. Well, normal people will that is. If you're a habitual TD poster, LTE may be bending your phone over and having its way with your battery daily.

This is long, I know, but it semi-explains the issue you may see and what could be causing it. It's much better to know why it's happening than to just be pissed off and clueless.

Glossary:
Capacitive Load - The amount in farads that a transistor must have while “ON” when being used as a switch. This means no more power can travel across the transistor while in this state.
Serialized Instructions - Only utilizes one core while processing program instructions.
Parallelized Instructions - Instructions may be streamed across multiple cores for faster processing.
Milliamp hour (maH) - The total amount of milliamps that may be drawn from the battery within an hour to fully deplete is. For example, a 1000 mAh rated battery may last 1 hour drawing 1000 mA (1 Amp), 5 hours drawing 200 mA (.2 Amps), or 10 hours drawing 100 mA (.1 Amps). 1000 mAh = 1 Ah.
Joules (J) - The energy expended (or work done) required to produce one watt of power for one second, or one watt-second (W·s).



This post was edited on 9/30 at 10:01 pm


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pivey14
Texas A&M Fan
Member since Mar 2012
11753 posts
 Online 

re: One iPhone thread to rule them all -- post all iPhone discussions here.


quote:

WARNING: TL;DR INCOMING
This is intended to put an explanation and "face" to the problems iPhone 5 users are facing. It also serves to compare the iPhone 4, 4S, and 5 from a comparative power consumption standpoint to explain the noticeable differences. The numbers and figures are not guaranteed to be 100% accurate, and I'm sure you'll find an error or a miscalculated capacitive load. Just trying to put minds at ease and give you a face to your battery life's enemy. Feel free to ignore all of this and enjoy your life. - Edsger Wybe PirateZac Dijkstra

The battery is actually much better, but the draw of LTE kills battery life much quicker. Also, the change in processor power (single to dual core)changes things when comparing the 4 to the 4S/5, as well, which is why we've seen outrage in both releases. I actually figured these out the other day to get an accurate measurement. I found the capacitive load (CL) myself, but it may be off a little Also, this only takes into account serialized instructions, and it does not account for multiple threads or parallelized instructions.

NOTE: nF(nanoFarads) = 1.0e-9 F

iPhone 5: 3.8V, 1440 mAh, 1.2 GHz(Dual)
CL: approx. .31452 nF (3.1452e-10F)

iPhone 4S: 3.7V, 1430 mAh, 1.0 GHz(Dual)
CL: approx. .3835 nF (3.835e-10F)

iPhone 4: 3.7V, 1420 mAh, 1.0 GHz(Single)
CL: approx. .38714 nF (3.8714e-10)

So, as we can see, the capacitive load is a bit less, and the voltage and the mAh are higher in the iPhone 5. The iPhone 4S actually looks to be be only marginally better than the iPhone 4, but what sticks out is a jump in battery life while making the switch to a dual core processor. This is one of the reasons their overall capactive load is so similar. When taking this into account, the clock speed is treated as handling serialized instructions at the max speed and voltage that they can handle. Because the 4S has a similar voltage and marginally higher mAh, it has a similar battery performance because the two cores are not taken into account so of course in theory, they should have had a similar battery life, right?

The problem is that we DO have two cores, and we have to acknowledge the trade offs of that. On one hand, if a portion of the instructions are parallelized, we can process two streams simultaneously to cut down on time spent processing those portions. That seems great, but we have two issues. The first is that not all instructions will always be parallelized so some of them must be run serialized, only utilizing one core. The second is that with the usage of a second core, we up the usage is power during that period. While dual-core may be more efficient in some cases, there are a ton where it consumes more power. So even though we spend less time processing instructions, we still have to deal with serialized instructions and also the case in which the dual-core sucks up more juice. There are also other factors that play into it, but that plays a factor in the 4S having a seemingly much worse battery life than the 4, even though they have similar battery specs.

Now, we move up to the iPhone 5. It's got much less of a capactive load, which is largely due to the use of the new Tri-Gate transistor, also called 3D transistors, technology that allows vertical transistors. This allows them to pack more transistors than they could traditional transistors into a similarly sized area, and they operate at lower voltages with less leakage. This should mean the battery should last much longer than its predecessors, right? Not quite. The problem is that the iPhone 5 has a much better power specs because it needs them for what they've added.

First, we have the A6 chip. It's got two-cores with a clock speed, from what I've seen, of around 1.2GHz. Obviously, this requires more power to operate, and with an mAh rating not much higher, that'll be an issue. The second major factor is the inclusion of LTE. In an AT&T test, the energy drain is proven to be higher for LTE. With 3G, the power drain is static. It's always going to be the same. With LTE, the drain is heavily dependent on the size of what's being transmitted. LTE has two DRX states for data transmission. When data is received, it goes into the short DRX state which consumes high power while receiving it, which is why we get mobile porn much faster on LTE.

The issue isn't with that, but instead, the problem lies in the with behavior of the long DRX state. The radio switches to the long DRX state, its tail state, after data is received and waits for more while remaining in high power mode. If it gets more, it loops into the cycle. Otherwise, it waits for a certain period before going idle again. This is where the big hit happens. You're no longer receiving anything or doing any tasks, but LTE is sitting in the long DRX state waiting for something else before switching off. Because 3G's consumption is static and its tail state is always in half power mode, it consumes less power.

The final numbers in the test had 3G consuming 34.67 J while LTE consumed 45.16 J. That means it consumed 30.2567% more energy than 3G for the test. That's a sizable difference, regardless of the fact that it could use less power at some points. Another factor that ties into that is that most of the people with iPhone 5's right now are using the shite out of them. It's a new, fast, fancy phone, and, of course, you're going to want to flex its muscles. This means you're probable also sending and receiving a lot of data, which in turn means you're using a frickton of LTE transmission. This would explain why the battery seems to be crying itself to sleep at night. I wouldn't worry about it too much, though.

Eventually, when your phone usage returns to normal "I've already played Doodle Jump a million times, and I just want to use my phone to text, call people, and occasionally, Google something to prove to someone that you're right and they're wrong" mode, you'll be alright. Well, normal people will that is. If you're a habitual TD poster, LTE may be bending your phone over and having its way with your battery daily.

This is long, I know, but it semi-explains the issue you may see and what could be causing it. It's much better to know why it's happening than to just be pissed off and clueless.








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Dav
LSU Fan
NOLA
Member since Feb 2010
5363 posts

re: One iPhone thread to rule them all -- post all iPhone discussions here.


Apple store in br got any today ?





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VABuckeye
Ohio State Fan
Oak Hill, VA
Member since Dec 2007
11177 posts
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re: One iPhone thread to rule them all -- post all iPhone discussions here.


Why don't you call them instead of asking a bunch of people that don't work there?





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BamaChick
USA Fan
Terminus
Member since Dec 2008
14900 posts

re: One iPhone thread to rule them all -- post all iPhone discussions here.


I called everywhere on Friday - all the AT&T stores in North Alabama, the big box stores, and the Apple Store.

I finally tried Radio Shack and they had quite a few - walked in, bought it, and got it activated in about 20 minutes.

So try Radio Shack if there is one near you.






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Dijkstra
USA Fan
Michael J. Fox's location in time.
Member since Sep 2007
6772 posts

re: One iPhone thread to rule them all -- post all iPhone discussions here.


quote:

So try Radio Shack if there is one near you.


Radio Shack is one of the best place to get those sort of products that are in low supply. No one remembers they exist.






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LittleSpoon
Notre Dame Fan
goals not standards
Member since May 2010
6348 posts

re: One iPhone thread to rule them all -- post all iPhone discussions here.


why does the software update take sooooo long





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catholictigerfan
LSU Fan
Member since Oct 2009
39143 posts

re: One iPhone thread to rule them all -- post all iPhone discussions here.


couple of questions

first do you think I will be able to go out tomorrow and be able to get an Iphone 5 meaning I wouldn't have to pre order the iphone 5 to get it? I'm with Sprint, getting phone in covington on highway 21

secondly is the iphone 5 worth a moths wait and 100 extra dollars? If they don't have them in stock.






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medtiger
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Cubs Fan
Member since Sep 2003
17603 posts

re: One iPhone thread to rule them all -- post all iPhone discussions here.


quote:

secondly is the iphone 5 worth a moths wait and 100 extra dollars?


Why would it be an extra $100 in a month?






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catholictigerfan
LSU Fan
Member since Oct 2009
39143 posts

re: One iPhone thread to rule them all -- post all iPhone discussions here.


Sorry I meant to say is that is it worth a month wait and 100 more dollars.

My options if its not available tomorrow is order an iphone 5 and get it at the end of this month for 200 dollars

Or get a iphone 4s for 100 Les dollars and have it tomorrow

I currently have a old beat up blackberry so either is an upgrade for me and I don't care if my phone is the latest greatest.






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pivey14
Texas A&M Fan
Member since Mar 2012
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re: One iPhone thread to rule them all -- post all iPhone discussions here.


Get the 5, I was about to make the same mistake, have some patience and get the new one because it is easily worth the $100





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catholictigerfan
LSU Fan
Member since Oct 2009
39143 posts

re: One iPhone thread to rule them all -- post all iPhone discussions here.


what are the chances I get it at the store tomorrow?





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VABuckeye
Ohio State Fan
Oak Hill, VA
Member since Dec 2007
11177 posts
 Online 

re: One iPhone thread to rule them all -- post all iPhone discussions here.


quote:

why does the software update take sooooo long


Only took about 15 minutes on my 4.






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BamaChick
USA Fan
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Member since Dec 2008
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re: One iPhone thread to rule them all -- post all iPhone discussions here.


The only 5's that our Apple store had in stock were Sprint models, so call and check.

As I said, Radio Shack had some for all carriers and as Zac mentioned, everyone forgets Radio Shack is even around anymore so people don't go there.

You can also try the online Apple reservation thing they have on their website.






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catholictigerfan
LSU Fan
Member since Oct 2009
39143 posts

re: One iPhone thread to rule them all -- post all iPhone discussions here.


Don't have time to go to the apple store will prob have to get it at the sprint store do they carry it there? I'm guessing they do







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BamaChick
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Member since Dec 2008
14900 posts

re: One iPhone thread to rule them all -- post all iPhone discussions here.


I would guess but from what it sounds like, the actual wireless brick and mortar stores (AT&T, Verizon, and Sprint)got less stock than other retailers.

My advice is to call all the places before you make a fruitless trip.

Good luck! I hope you find one - I haven't stopped playing with it since Friday. TWSS






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VABuckeye
Ohio State Fan
Oak Hill, VA
Member since Dec 2007
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re: One iPhone thread to rule them all -- post all iPhone discussions here.


quote:

I haven't stopped playing with it since Friday


Dammit woman, stop playing with it.






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BamaChick
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re: One iPhone thread to rule them all -- post all iPhone discussions here.








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