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i7-3840QM or i7-3740QM

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Nebutor1n

macrumors newbie
Original poster
Aug 21, 2013
3
0
I want to buy a MacBook Pro 15 Retina early 2013 with 16GB of RAM, I have a hard issue in choosing a processor i7-3840QM and i7-3740QM, please tell me they have a difference in the 0,1 GHz and 6 or 8 Cache. I will use very often on Parallels with Windows 7. I do not work with graphics software and video editing, but it will be very hard-loaded my Parallels other software. Tell me please, I really need your help in choosing the configuration.

PS: I had a sad experience with Parallels included in unit 2012 2.6GHz and 8GB of RAM, I had to sell it due to the fact that expand the RAM failed in this model MacBook and very much caught bugs in Windows Parallels.
 
dusk007

dusk007

macrumors 68040
Dec 5, 2009
3,411
104
It won't make any noticeable difference at all.
If you had notebooks in both specs in front of you, you'd have problems figuring out which one is the faster, unless you fire up some benchmark program.
 
C

cirus

macrumors 6502a
Mar 15, 2011
582
0
There will be no difference.

The problem is that apple doesn't allow its CPUs to reach full turbo so they perform worse than in a comparable notebook.

http://www.notebookcheck.net/Review-Apple-MacBook-Pro-15-Retina-2-3-GHz-Mid-2012.78959.0.html

2.3 ghz version in cinebench R11.5 only reaches 5.5 points vs what should be ~6.2 points.

47675.png


The 2.6 ghz version reaches 6.4 points.

54424.png


Yet that is exactly what you should be reaching with a 2.4 ghz chip.

Not cool apple. :mad:

If you are buying this computer to use Win 7 and you need a lot of performance it might be better to just buy a PC. But if you want a mac then I doubt you will notice any difference between the two.
 
C

cbautis2

macrumors 6502a
Aug 17, 2013
894
1,106
It's not the Apple hardware that limits the Turbo Boost but OS X itself. If you bootcamp Windows 7, you'll see that the Turbo Boost is activated indeed and is completely working even when all threads are loaded.
 
N

Nebutor1n

macrumors newbie
Original poster
Aug 21, 2013
3
0
That is, the easier it will be for me to take 2.7 GHz or pay money for 2.8? Thanks
 
sofianito

sofianito

macrumors 65816
Jan 14, 2011
1,207
2
Spain
cbautis2 said:
It's not the Apple hardware that limits the Turbo Boost but OS X itself.
Click to expand...
Why would OS X limit the Turbo Boost? And how technically it could limit the Turbo Boost with Software?

If you bootcamp Windows 7, you'll see that the Turbo Boost is activated indeed and is completely working even when all threads are loaded.
Click to expand...
Do you mean Turbo Boost reaches its max speed?
 
robvas

robvas

macrumors 68040
Mar 29, 2009
3,240
629
USA
cirus said:
There will be no difference.

The problem is that apple doesn't allow its CPUs to reach full turbo so they perform worse than in a comparable notebook.

http://www.notebookcheck.net/Review-Apple-MacBook-Pro-15-Retina-2-3-GHz-Mid-2012.78959.0.html

2.3 ghz version in cinebench R11.5 only reaches 5.5 points vs what should be ~6.2 points.

Image

The 2.6 ghz version reaches 6.4 points.

Image

Yet that is exactly what you should be reaching with a 2.4 ghz chip.

Not cool apple. :mad:

If you are buying this computer to use Win 7 and you need a lot of performance it might be better to just buy a PC. But if you want a mac then I doubt you will notice any difference between the two.
Click to expand...

The MBPr 15" i7 in the test performs almost identically to the top performer in the second test. What are you talking about?
 
Mr. Retrofire

Mr. Retrofire

macrumors 603
Mar 2, 2010
5,064
519
www.emiliana.cl/en
cbautis2 said:
It's not the Apple hardware that limits the Turbo Boost but OS X itself.
Click to expand...
As far as i know, that is exactly what Intel tells the kernel developers (Linux, Darwin (OS X), Windows, et cetera) in the appropriate developer documentation. So this is the correct behavior.

cbautis2 said:
If you bootcamp Windows 7, you'll see that the Turbo Boost is activated...
Click to expand...
You can use this utility on OS X, if you want to see this information.

cbautis2 said:
...indeed and is completely working even when all threads are loaded.
Click to expand...
This is a hardware feature (Turbo Boost 2.0). Turbo Boost 2.0 supports more than one core and is available in Sandy Bridge or newer processors, such as the i7.
 
C

cirus

macrumors 6502a
Mar 15, 2011
582
0
robvas said:
The MBPr 15" i7 in the test performs almost identically to the top performer in the second test. What are you talking about?
Click to expand...

Yes, the 2.6 ghz cpu performs exactly as well as the 2.4 ghz 3630qm. Its loosing 200 mhz of turbo.
 
sarthak

sarthak

macrumors 6502
Nov 19, 2012
467
6
According to geekbench browser on average there is a 500 - 1000 point difference between the 3740qm and 3840qm.
 
Interstella5555

Interstella5555

macrumors 603
Jun 30, 2008
5,219
13
As a general rule if you need to ask about the performance difference between processors you likely won't notice it.
 
N

Nebutor1n

macrumors newbie
Original poster
Aug 21, 2013
3
0
Well, you want to say that the same program will work better in Boot Camp on Window 7 than on OS X? Why Apple advertises Turbo Boost acceleration under the load of the processor, if it doesn't work? Where is the logic of the Lord?)
 
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