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Old Sep 20, 2013, 04:55 PM   #201
Mike in Kansas
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Quote:
Originally Posted by sofianito View Post
Out of curiosity, I installed the Intel Power Gadget on my i7/8GB/512GB and since it takes samples every 50ms by default, I'd like to know if it'll impact the performance... I know I can increase the sampling frame and avoid logging data to file, but would it still impact?

Any thoughts on this?

Thanks.
Ahh, good old Heisenberg, eh? ;-)

My experience on a 2012 i7 MBA suggests that at the longest sampling increment (500 ms) it consumes 0.8% - 1.2%. At the shortest sampling increment (20 ms) it seems to consume 1.6% - 2.0% of the CPU power. So its impact seems to be measurable but not overly significant compared to other programs.

During idle, the processor speed is the same regardless of the sampling increment set in Power Gadget.
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Old Sep 20, 2013, 05:30 PM   #202
sofianito
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Quote:
Originally Posted by Mike in Kansas View Post
Ahh, good old Heisenberg, eh? ;-)

My experience on a 2012 i7 MBA suggests that at the longest sampling increment (500 ms) it consumes 0.8% - 1.2%. At the shortest sampling increment (20 ms) it seems to consume 1.6% - 2.0% of the CPU power. So its impact seems to be measurable but not overly significant compared to other programs.

During idle, the processor speed is the same regardless of the sampling increment set in Power Gadget.
Thanks for the information , but how did you get those numbers?

To measure the impact, I run 3 GeekBench tests with IPG running and then without IPG running, calculate the mean of each test suite, and then calculate the difference:

Code:
GeekBench 32-bit: IPG vs Non IPG
1/3 : 7443 vs 7483
2/3 : 7376 vs 7429
3/3 : 7390 vs 7383
Mean: 7403 vs 7431.66
Efficiency percentage: ((7431.66 - 7403) * 100)/ 7403 = 0.387%
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Last edited by sofianito; Sep 20, 2013 at 05:51 PM.
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Old Sep 20, 2013, 06:26 PM   #203
Rick-ITA
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Hello!

I'm still debating wheter I prefer a rMBP or an MBA.

In case I select the MBA, I read in this topic that "for usual tasks" the upgrade from i5 to i7 is minimal and does worth the money.

Since it's not clear to me what do you refer with usual tasks, here's what I need the MBA for:

- Adobe Lightroom 5, raw processing (occasional, for hobby, let say two times a month, 100-150 photos each time).
- Use of windows software with parallels or some kind of virtual machine (daily use - scientific workplace)
- database analysis with stata
- Internet, watch movies, office, photos....

Consider that 150€ is not an indifferent sum of money for me, but I'm willing to spend that money if I will notice a significative upgrade.

Suggestion?
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Old Sep 20, 2013, 08:41 PM   #204
magbarn
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Quote:
Originally Posted by Rick-ITA View Post
Hello!

I'm still debating wheter I prefer a rMBP or an MBA.

In case I select the MBA, I read in this topic that "for usual tasks" the upgrade from i5 to i7 is minimal and does worth the money.

Since it's not clear to me what do you refer with usual tasks, here's what I need the MBA for:

- Adobe Lightroom 5, raw processing (occasional, for hobby, let say two times a month, 100-150 photos each time).
- Use of windows software with parallels or some kind of virtual machine (daily use - scientific workplace)
- database analysis with stata
- Internet, watch movies, office, photos....

Consider that 150€ is not an indifferent sum of money for me, but I'm willing to spend that money if I will notice a significative upgrade.

Suggestion?
Here, I've posted this previously


The i5 was noticeably slower processing the RAW files out of my D800. The i7 feels about the same as my wife i5 base rMBP and this graph confirms it.
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Old Sep 21, 2013, 06:56 AM   #205
magnumpi
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According to Anandtech's MBA i7 vs i5 comparison (http://www.anandtech.com/show/7113/2...ore-i7-4650u/2) there is a 27% performance increase in single threaded operations and a 17% performance increase in multithreaded operations. I believe is worth the upgrade, that's what I did –along with the RAM upgrade– and so far I don't regret it.
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Old Sep 21, 2013, 07:06 AM   #206
Rick-ITA
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Thanks, one other question.

With the standard 128gb SSD, OS installed + office and parallels (or vmare) and what's needed to have a windows virtual machine, how much space I've left for other programs and my data? Thanks
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Old Sep 21, 2013, 09:30 AM   #207
magnumpi
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I can't check it right now but I believe the MBA comes with about 110GB free out the box and a basic VMware Windows 8 VM is about 20 GB.
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Old Sep 25, 2013, 04:04 PM   #208
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I'm planning to upgrade my 2011 MBA (see signature).

The 8 GB is a no-brainer, and I've decided to max the SSD. But the cpu...

At first, I was thinking of getting the i5. Now I'm leaning towards the i7.

Thoughts on the following statements would be deeply appreciated.
1: The i5 gives better battery life
2: The i7 makes the computer warmer than the i5 does
3: The i5 will feel slower than my current 2011 i7
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Old Sep 25, 2013, 09:03 PM   #209
B...
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Quote:
Originally Posted by sergiobaschi View Post
I'm planning to upgrade my 2011 MBA (see signature).

The 8 GB is a no-brainer, and I've decided to max the SSD. But the cpu...

At first, I was thinking of getting the i5. Now I'm leaning towards the i7.

Thoughts on the following statements would be deeply appreciated.
1: The i5 gives better battery life
2: The i7 makes the computer warmer than the i5 does
3: The i5 will feel slower than my current 2011 i7
1. Usually
2. Usually
3. Depends on what you use it for.
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Old Sep 25, 2013, 09:35 PM   #210
laserbeam273
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Quote:
Originally Posted by sergiobaschi View Post
I'm planning to upgrade my 2011 MBA (see signature).

The 8 GB is a no-brainer, and I've decided to max the SSD. But the cpu...

At first, I was thinking of getting the i5. Now I'm leaning towards the i7.
I "no brained" a 4 GB MBA last year and it was fine for all average usage - browsing and iTunes, Starcraft II, some web development.

People seem to forget the benefits of SSDs... if you page out onto a spinning harddrive, it's death, but if you page out onto an SSD, particularly a 800 MB/S PCI-E SSD!!!!, it's nowhere near as much of an issue.

Though it does depend on how long you want this MBA to last. If well over 2 years, then you need to jump on i7 and 8 GB RAM. If not, and if you're not using it for heavy duty stuff, then i5 and 4 GB would be fine.


Also, an i5 2013 will beat an i7 2011 for pretty much everything. Seriously, the new SSDs are psycho and will make a big difference. Not to mention the improved processor architecture.
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Old Sep 26, 2013, 06:48 AM   #211
DisplacedMic
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Quote:
Originally Posted by sergiobaschi View Post
I'm planning to upgrade my 2011 MBA (see signature).

The 8 GB is a no-brainer, and I've decided to max the SSD. But the cpu...

At first, I was thinking of getting the i5. Now I'm leaning towards the i7.

Thoughts on the following statements would be deeply appreciated.
1: The i5 gives better battery life
2: The i7 makes the computer warmer than the i5 does
3: The i5 will feel slower than my current 2011 i7
higher clock rate will generally require more power which will reduce battery life relative to a lower clock rate.
the same goes for heat. - higher processing tasks will generate more heat.

whether those things are noticeable in so-called "real world applications" isn't clear. i have an i7 and it only rarely gets above ambient.

i don't know about your third question...maybe? it really depends what you do with it.
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Old Sep 26, 2013, 09:37 AM   #212
Scott6666
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This all has been confusing enough that I'm seriously thinking of getting an i5 and an identical i7 and comparing them side-by-side.

[You can't find an i7 on display at Apple retail to try for yourself, they're all i5's, despite the fact they claim to have the ultimate in stock.]
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Old Sep 26, 2013, 12:12 PM   #213
Tfb
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i7 cheaper than i5

I was all set on the i5 and now the i7 is in the Refurb Store for cheaper than the i5 configuration I wanted: 8/256

Battery life is more important to me than performance. Is it crazy to pay extra for the i5?

I tend to keep a lot of programs open at once, but the programs I use seem pretty basic (word + excel + browser with tons of tabs + Civilization + Acrobat Pro). Will I get any benefit at all from the i7?
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Old Sep 29, 2013, 11:47 PM   #214
Booji
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Quote:
Originally Posted by Tfb View Post
I was all set on the i5 and now the i7 is in the Refurb Store for cheaper than the i5 configuration I wanted: 8/256

Battery life is more important to me than performance. Is it crazy to pay extra for the i5?

I tend to keep a lot of programs open at once, but the programs I use seem pretty basic (word + excel + browser with tons of tabs + Civilization + Acrobat Pro). Will I get any benefit at all from the i7?
If battery life is what is important, stick with the i5.

You don't know the difference in speed based on your use.
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Old Oct 7, 2013, 05:55 AM   #215
Crazy Badger
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I was all set on buying the i5/8/512 but when I got to the store they didn't stock that configuration, so ended up with the i7/8/512!

Don't know about 2013 i5 v i7 but ultimate MBA 2010 v 2013 is incredible
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Old Nov 5, 2013, 01:30 PM   #216
Flowiee
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i5 or i7 or even rMBP

Hi all,

Can't decide if i7 is needed for me, or if I even need to bump for rMBP.
Heres my story;

Student (keynote/numbers/pages), Autodesk Inventor (3d drawing), casual gaming (guildwars 2 / football manager), few times a year Imovie (maybe more in the future), music editing software.

Want to keep the laptop for like 5 years.

Possible options;
Air: 1.3/8/256 €1343
Air: 1.7/8/256 €1485
rMBP: 2.4/8/256 €1437
rMBP: 2.6/8/256 €1532

So, which is the best option for me? I like battery life, and I dont really need the Retina display, but it's only €100 more comparing to the 1.3 Air and even cheaper then the 1.7 Air.

Can anyone give me some good advice? also about the problems everyone has now with the rMBP.

Thanks in advance!

Last edited by Flowiee; Nov 5, 2013 at 01:53 PM.
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Old Nov 6, 2013, 01:41 AM   #217
iamthedudeman
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All the info between the two processors you will ever need.

Yes the i7 is worth it.

http://forums.macrumors.com/newreply...e=1&p=18313926
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