sakabaro

macrumors regular
Original poster
Feb 24, 2015
149
94
Just got the new macbook CTO 1.3Ghz. Everything indicates a 1.3Ghz CPU apart when I run:

sysctl -n machdep.cpu.brand_strin

I am getting:

Intel(R) Core(TM) M-5Y71 CPU @ 1.20GHz

Any explanation?
 

zhenya

macrumors 604
Jan 6, 2005
6,825
3,509
Well, the 1.3 chips I believe are from the same line as the 1.2 chips, but the ones that 'binned' a bit higher, and as such are capable of being run a bit faster. So at the core, they may be identified as the same chip.
 
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cbautis2

macrumors 6502a
Aug 17, 2013
851
987
Intel allowed configurable TDP and base clock rate (based on TDP) on the Core M. On some Windoze laptops, Core M 5Y71 is configured to 1.4 GHz base with 6 W TDP.
 
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sakabaro

macrumors regular
Original poster
Feb 24, 2015
149
94
That's weird.

Can people post here the result of the `sysctl -n machdep.cpu.brand_strin` here for their MB? (Just go to the terminal and copy/paste it.) Thanks!
 
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MyopicPaideia

macrumors 68020
Mar 19, 2011
2,144
965
Sweden
It is just telling you the base clock of the part number. 5Y71 has a base clock of 1.2, the 5Y51 a base clock of 1.1, and the 5Y31 0.9.

Apple is overclocking all three of these processors to a different degree but the command you are running just returns the part number, it doesn't reflect any overclocking...

So it really isn't that weird at all.
 
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MyopicPaideia

macrumors 68020
Mar 19, 2011
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965
Sweden
Well, the 1.3 chips I believe are from the same line as the 1.2 chips, but the ones that 'binned' a bit higher, and as such are capable of being run a bit faster. So at the core, they may be identified as the same chip.

Nope different part numbers, see above.
 
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sakabaro

macrumors regular
Original poster
Feb 24, 2015
149
94
Cool, thanks, don't really get why Apple doesn't stick to the part name in their product description, but whatever I guess.
 
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MyopicPaideia

macrumors 68020
Mar 19, 2011
2,144
965
Sweden
Cool, thanks, don't really get why Apple doesn't stick to the part name in their product description, but whatever I guess.
Yeah, it isn't Apple that decides what string the Intel processor returns for that command. And it is accurate in any case...
 
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Gav2k

macrumors G3
Jul 24, 2009
9,216
1,607
It is just telling you the base clock of the part number. 5Y71 has a base clock of 1.2, the 5Y51 a base clock of 1.1, and the 5Y31 0.9.

Apple is overclocking all three of these processors to a different degree but the command you are running just returns the part number, it doesn't reflect any overclocking...

So it really isn't that weird at all.
There is no 'over clocking' taking place. The base clock has a range and apples between the min/max figure for the chips specifications
 
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jerwin

Suspended
Jun 13, 2015
2,895
4,649
That's weird.

Can people post here the result of the `sysctl -n machdep.cpu.brand_strin` here for their MB? (Just go to the terminal and copy/paste it.) Thanks!
should't that be

sysctl -n machdep.cpu.brand_string

?
 
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