Battery Life i5 vs i7, anything definitive yet?

Jazwire

macrumors 6502a
Original poster
Jun 20, 2009
896
115
127.0.0.1
I haven't been able to come across anything definitive yet on wether or not Haswell i5 vs i7 upgrade consumes more power or makes more heat.

Last year there was a difference, that was tested in a real world situation.

According to Intel's specs, both the i5 and i7 have the same power draw, which would lead one to believe their may not be a difference or if so almost unmeasurable.

If we go based of previous chips & experience then the i5 will have better bat life & less heat than the i7.

If we go based on the tech specs give by Intel the i5 & i7 will have negligible differences in battery life and heat.

Anyone come across any real world tests , even if not a mac, but just the chips themselves?
 

ladeer

macrumors 6502
Feb 15, 2007
391
10
I ordered an i5 on the first day, but cancelled it today so I could get one from the mall. I couldn't wait till next week!! My apple only carries the most basic or the highest end, so I had to choose the i7 with 8gb and 512gb ssd. Here are my first impressions:

1. battery is ridiculous. it's giving me 15+ hours as i am browsing/typing on forum. yes, 15+ hours.
2. with vmware on running heavy windows 8 (cpu greater than 100%; i am not sure how is that possible, but that's what it says on my top), i was getting about 7-8 hrs. for a reference, i only got about 2.5 hrs on my 15 inch 2011 mbp 256 ssd 16gb memory w/ vmware running windows 8.
3. black magic disk test yielded more than 900mbs read/write
4. no need for thunderbolt external drive unless u r using ssd raid. the bottleneck is going to be the hard disk in your external hard drive enclosure!
5. i did a migration assistant migration from my mbp15 to my new mba using direct thunderbolt connection (start the machine while pressing T). to my surprise, the transfer was super slow. it took 22 minutes to complete the process of migrating 183 gb of files. that's only an average of 138mb/s! maybe the migration assistant did more than moving file. maybe it was setting/configuring my lib/app folders for the new hardware? anyway, it was way slower than i expected. (the transfer was from a sansumg 830 256gb ssd to ePIC mba 512gb ssd)

http://oi43.tinypic.com/90t1j5.jpg

this is after using it on battery for an hour.
 
Last edited:

dingdongbubble

macrumors 6502a
Jun 1, 2007
538
0
I ordered an i5 on the first day, but cancelled it today so I could get one from the mall. I couldn't wait till next week!! My apple only carries the most basic or the highest end, so I had to choose the i7 with 8gb and 512gb ssd. Here are my first impressions:

1. battery is ridiculous. it's giving me 15+ hours as i am browsing/typing on forum. yes, 15+ hours.
2. with vmware on running heavy windows 8 (cpu greater than 100%; i am not sure how is that possible, but that's what it says on my top), i was getting about 7-8 hrs. for a reference, i only got about 2.5 hrs on my 15 inch 2011 mbp 256 ssd 16gb memory w/ vmware running windows 8.
3. black magic disk test yielded more than 900mbs read/write
4. no need for thunderbolt external drive unless u r using ssd raid. the bottleneck is going to be the hard disk in your external hard drive enclosure!
5. i did a migration assistant migration from my mbp15 to my new mba using direct thunderbolt connection (start the machine while pressing T). to my surprise, the transfer was super slow. it took 22 minutes to complete the process of migrating 183 gb of files. that's only an average of 138mb/s! maybe the migration assistant did more than moving file. maybe it was setting/configuring my lib/app folders for the new hardware? anyway, it was way slower than i expected. (the transfer was from a sansumg 830 256gb ssd to ePIC mba 512gb ssd)

http://oi43.tinypic.com/90t1j5.jpg

this is after using it on battery for an hour.
I'm getting the same MBA in the mail. I'm travelling so I doubt there would be 8GB MBA 13 stock left in store by the time I get back. But your results are very very very impressive. It genuinely looks like all day battery that I can rely on all day when I go for lectures. No need to carry a charger anymore.
 

newdeal

macrumors 68020
Oct 21, 2009
2,361
1,436
I assume the battery life is amazing which is why no one has any reviews up yet, still waiting for the battery life tests to complete
 

sick z33

macrumors 6502
Sep 20, 2008
291
3
A friend of mine at work claims he got 13+ hours last night after buying his I7 in the morning and using all day.
 

hammm

macrumors member
Apr 23, 2013
55
14
I ordered an i5 on the first day, but cancelled it today so I could get one from the mall. I couldn't wait till next week!! My apple only carries the most basic or the highest end, so I had to choose the i7 with 8gb and 512gb ssd. Here are my first impressions:

1. battery is ridiculous. it's giving me 15+ hours as i am browsing/typing on forum. yes, 15+ hours.
2. with vmware on running heavy windows 8 (cpu greater than 100%; i am not sure how is that possible, but that's what it says on my top), i was getting about 7-8 hrs. for a reference, i only got about 2.5 hrs on my 15 inch 2011 mbp 256 ssd 16gb memory w/ vmware running windows 8.
3. black magic disk test yielded more than 900mbs read/write
4. no need for thunderbolt external drive unless u r using ssd raid. the bottleneck is going to be the hard disk in your external hard drive enclosure!
5. i did a migration assistant migration from my mbp15 to my new mba using direct thunderbolt connection (start the machine while pressing T). to my surprise, the transfer was super slow. it took 22 minutes to complete the process of migrating 183 gb of files. that's only an average of 138mb/s! maybe the migration assistant did more than moving file. maybe it was setting/configuring my lib/app folders for the new hardware? anyway, it was way slower than i expected. (the transfer was from a sansumg 830 256gb ssd to ePIC mba 512gb ssd)

http://oi43.tinypic.com/90t1j5.jpg

this is after using it on battery for an hour.
Then my question to you is, how long does it take to charge this thing? Maybe from like 10% to 100%.

My 4th Gen iPad last me between 10-12 hours of usage, but it takes like 5 damn hours to charge :mad:
 

curtoise

macrumors 6502a
Apr 19, 2010
529
13
I ordered an i5 on the first day, but cancelled it today so I could get one from the mall. I couldn't wait till next week!! My apple only carries the most basic or the highest end, so I had to choose the i7 with 8gb and 512gb ssd. Here are my first impressions:

1. battery is ridiculous. it's giving me 15+ hours as i am browsing/typing on forum. yes, 15+ hours.
2. with vmware on running heavy windows 8 (cpu greater than 100%; i am not sure how is that possible, but that's what it says on my top), i was getting about 7-8 hrs. for a reference, i only got about 2.5 hrs on my 15 inch 2011 mbp 256 ssd 16gb memory w/ vmware running windows 8.
3. black magic disk test yielded more than 900mbs read/write
4. no need for thunderbolt external drive unless u r using ssd raid. the bottleneck is going to be the hard disk in your external hard drive enclosure!
5. i did a migration assistant migration from my mbp15 to my new mba using direct thunderbolt connection (start the machine while pressing T). to my surprise, the transfer was super slow. it took 22 minutes to complete the process of migrating 183 gb of files. that's only an average of 138mb/s! maybe the migration assistant did more than moving file. maybe it was setting/configuring my lib/app folders for the new hardware? anyway, it was way slower than i expected. (the transfer was from a sansumg 830 256gb ssd to ePIC mba 512gb ssd)

http://oi43.tinypic.com/90t1j5.jpg

this is after using it on battery for an hour.
It looks like the i7 will not have a big impact on battery life if you are getting those readings, I doubt the i5 will give you more hours (16?)
 

Freakyshiat

macrumors regular
Mar 18, 2011
119
1
apple tested battery life with the i5, and performance with i7. There's your answer right there. :)
 

curtoise

macrumors 6502a
Apr 19, 2010
529
13
apple tested battery life with the i5, and performance with i7. There's your answer right there. :)
I know that and I'm trying to find out the difference on battery impact on i7 vs i5 as I have a 11" i7 in order and I'm planning to change it to i5 if the battery life will suffer with the more powerful processor (plus heat and faster fan start times)
 

Jazwire

macrumors 6502a
Original poster
Jun 20, 2009
896
115
127.0.0.1
I know that and I'm trying to find out the difference on battery impact on i7 vs i5 as I have a 11" i7 in order and I'm planning to change it to i5 if the battery life will suffer with the more powerful processor (plus heat and faster fan start times)
^ Me too. :)


Willing to pay the extra $ , if it means little to no, battery loss & heat difference.
 

Freakyshiat

macrumors regular
Mar 18, 2011
119
1
In a 11", which is a smaller chassis, I personally myself would go with the i5. With an i7, fans would come on quicker I bet, temp would be a little higher and the 9 hour battery life would suffer also.

I would go with the i7 in the 13 inch chassis, as there is more room inside, and can dissipate a little better before turning on the fan. I dont care about the price difference, even if the i7 was the same price I would still go with the i5 as I would want a cooler running, longer lasting (battery) system as opposed to one that does something 5 percent quicker once/twice a week at the expense of heat/battery life.
 

curtoise

macrumors 6502a
Apr 19, 2010
529
13
In a 11", which is a smaller chassis, I personally myself would go with the i5. With an i7, fans would come on quicker I bet, temp would be a little higher and the 9 hour battery life would suffer also.

I would go with the i7 in the 13 inch chassis, as there is more room inside, and can dissipate a little better before turning on the fan. I dont care about the price difference, even if the i7 was the same price I would still go with the i5 as I would want a cooler running, longer lasting (battery) system as opposed to one that does something 5 percent quicker once/twice a week at the expense of heat/battery life.
Those are also my thoughts, less chassis on the 11'' will make heat disispation worse than the 13'', the i5 will probably be a better option on the 11' Air.
 

dmpep

macrumors newbie
Jun 14, 2013
5
0
I'm willing to know if there is difference in battery loss & heat difference. Nobody knows that?
 

Bear

macrumors G3
Jul 23, 2002
8,089
4
Sol III - Terra
...
2. with vmware on running heavy windows 8 (cpu greater than 100%; i am not sure how is that possible, but that's what it says on my top), i was getting about 7-8 hrs. for a reference, i only got about 2.5 hrs on my 15 inch 2011 mbp 256 ssd 16gb memory w/ vmware running windows 8.
...
5. i did a migration assistant migration from my mbp15 to my new mba using direct thunderbolt connection (start the machine while pressing T). to my surprise, the transfer was super slow. it took 22 minutes to complete the process of migrating 183 gb of files. that's only an average of 138mb/s! maybe the migration assistant did more than moving file. maybe it was setting/configuring my lib/app folders for the new hardware? anyway, it was way slower than i expected. (the transfer was from a sansumg 830 256gb ssd to ePIC mba 512gb ssd)
2. Some applications record CPU per core, so if you had 2 cores running maxed out, that would be 200% CPU usage.
5.It does do configuration as it is copying files.

I'm willing to know if there is difference in battery loss & heat difference. Nobody knows that?
According to the Intel website, both processors have the same power draw and thermal dissipation. I don't think getting an i7 will cause anyone any issues.
 

sk3tch

macrumors regular
Oct 31, 2003
102
0
I worked with a friend yesterday that bought the base 11" MBA (i5/4GB/128GB) we left in the morning with his MBA fully charged and by the end of the day (around 4PM he stopped working) he had about 10% left - so that's around 7 hours of dev work (he builds flash and iOS games)...not too shabby.
 

blesscheese

macrumors 6502a
Apr 3, 2010
694
170
Central CA
Problem:
laptop mag says 'fan can get noisy when playing games'. So you can bet the fan turning on more for the i7, even more so in the smaller 11 inch chassis. Just something to consider..
Solution:
Turn up your volume *really loud*. Can't hear the fans anymore? Problem solved...:D
 

edmondtw

macrumors newbie
Jun 19, 2013
2
0
I bought 2 of the 2013 13 inch MBAs with i7 to replace 2010 MBAs in my company. As there is no outward change in appearance, the extra long battery life was the driving factor. However, with one we are getting only 6 hours and the other probably around 8. This is at 75% brightness and this is just responding to e-mails and using MS Word; no video or intensive graphics. This is inconsistent with the early reviews I am seeing on the Internet where reviewers are gushing about 12 to 14 hour battery life. Did we get our computers from a batch of lemons??
 

johnjey

macrumors regular
Jun 17, 2013
245
2
Northern CA
In a 11", which is a smaller chassis, I personally myself would go with the i5. With an i7, fans would come on quicker I bet, temp would be a little higher and the 9 hour battery life would suffer also.

I would go with the i7 in the 13 inch chassis, as there is more room inside, and can dissipate a little better before turning on the fan. I dont care about the price difference, even if the i7 was the same price I would still go with the i5 as I would want a cooler running, longer lasting (battery) system as opposed to one that does something 5 percent quicker once/twice a week at the expense of heat/battery life.
Thank you .this makes sense to me and i think i will get the i5 in 11 inches :)
 

MLMcMillion

macrumors regular
Oct 8, 2012
103
173
Arkansas, USA
I've got an i7, and doing basic browsing / web dev work, I'm getting about 6-7 hours. Not entirely thrilled, as my rMBP easily got 5.5 doing the same work.
 

Booji

macrumors 6502a
Nov 17, 2011
650
361
Tokyo
If you are buying an Air for mobility, then the i5 seems like a no-brainer choice. Battery life is key driver for the 2013 models so its logic to take the choice that maximizes it as much as possible.