1600MHz works and runs at 1600 MacBook Pro 2011

Hackintosh Sr.

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Original poster
Dec 11, 2008
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Just thought I would let you guys know since I was curious. Even though our MacBooks come with 1333mhz ram, the processor is capable of 1600mhz. When I put my 1600 Kingston ram in it initialized at 1600!


I used
http://www.provantage.com/kingston-technology-khx1600c9s3k2-8g~7KINM1RK.htm
 

cmclaughlan

macrumors member
Sep 13, 2007
43
0
Can you show a screenshot of anything recognizing the RAM as 1600 ?

Not that I don't trust you but it sounds pretty darned cool !
 

thunng8

macrumors 6502a
Feb 8, 2006
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Hackintosh Sr. said:
Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_3_1 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8G4 Safari/6533.18.5)

Just thought I would let you guys know since I was curious. Even though our MacBooks come with 1333mhz ram, the processor is capable of 1600mhz. When I put my 1600 Kingston ram in it initialized at 1600!


I used
http://www.provantage.com/kingston-technology-khx1600c9s3k2-8g~7KINM1RK.htm
Are you able to do a few benchmarks like geekbench or cinebench?
 

Hackintosh Sr.

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I know screenshots or nothing. As soon as I get home I'll post. 2-3 seconds was cut off boot. It's hard to tell speed cause I installed a vertex 3 240gb along with it :p
 

Hackintosh Sr.

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Hackintosh Sr. said:
Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_3_1 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8G4 Safari/6533.18.5)

I know screenshots or nothing. As soon as I get home I'll post. 2-3 seconds was cut off boot. It's hard to tell speed cause I installed a vertex 3 240gb along with it :p
Not along with it :p I booted with vertex 3 a few times then put the ram in. Noticed a couple seconds but could be nothing. I'll try to bench for u guys
 

daneoni

macrumors G4
Mar 24, 2006
10,803
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That just proves the RAM is recognised not that it is actually running at 1600MHz. The machine could be downclocking the chips to the standard 1333MHz which is very common. Same story with machines which only support 3.5GB of RAM. They recognise when 4GB have been installed but only use the 3.3-3.5GB they are limited to.
 

Hackintosh Sr.

macrumors regular
Original poster
Dec 11, 2008
225
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That just proves the RAM is recognised not that it is actually running at 1600MHz. The machine could be downclocking the chips to the standard 1333MHz which is very common. Same story with machines which only support 3.5GB of RAM. They recognise when 4GB have been installed but only use the 3.3-3.5GB they are limited to.

So how do you tell for sure? I would think it would list as 1333 if its downclocked.
 

JamesGorman

macrumors 65816
Dec 31, 2008
1,123
1
Winnipeg
That just proves the RAM is recognised not that it is actually running at 1600MHz. The machine could be downclocking the chips to the standard 1333MHz which is very common. Same story with machines which only support 3.5GB of RAM. They recognise when 4GB have been installed but only use the 3.3-3.5GB they are limited to.
Not true. I have 1333 MHZ sticks installed in my machine, and "about this mac" Sees them as 1067.
 
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Pentad

macrumors 6502a
Nov 26, 2003
985
94
Indiana
That just proves the RAM is recognised not that it is actually running at 1600MHz. The machine could be downclocking the chips to the standard 1333MHz which is very common. Same story with machines which only support 3.5GB of RAM. They recognise when 4GB have been installed but only use the 3.3-3.5GB they are limited to.
I'm not trying to give you a hard time but that is not a good analogy. The system board does 'see' all the ram but Windows has problems with it.

Windows XP/Vista/7 32bit only will see 3.5 Gig

Windows 2003 Server 32bit (which uses an slightly modified XP Kernal) will see MORE than 4 Gig. No kidding...

So software and hardware viewing memory isn't a good analogy...
 

Pentad

macrumors 6502a
Nov 26, 2003
985
94
Indiana
Not true. I have 1333 MHZ sticks installed in my machine, and "about this mac" Sees them as 1067.
I bought 1333 Corsair memory (2 x 4 Gig sticks) and my MBP does report them at 1333.

Are you sure you bought 1333? Quality memory? Reputable dealer?

Just asking... :)

-P
 

NikFinn

macrumors 6502a
Jun 22, 2009
646
0
MA
I bought 1333 Corsair memory (2 x 4 Gig sticks) and my MBP does report them at 1333.

Are you sure you bought 1333? Quality memory? Reputable dealer?

Just asking... :)

-P
If he installed them in the machine listed in his sig, then it does not support 1333mhz RAM, hence why it is down-clocked to 1066mhz.
 

aznguyen316

macrumors 68010
Oct 1, 2008
2,000
0
Tampa, FL
Hmm this is very interesting. Nice... too bad I just bought some 1333Mhz ram.

Also to note, if I remember correctly, only the 2.2 and 2.3 i7 support 1600Mhz ram while the 2.0 2630qm does not. Feel free to correct me if I am mistaken.

OP, can you go to your system profiler and go to the memory slot. And double check it reads as speed: 1600Mhz thank you.
 

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mackage

macrumors 6502
Apr 6, 2011
274
3
Isn't it true that RAM cannot run any faster than your FSB? The FSB in the 2011 is 1333.
 

squeakr

macrumors 68000
Apr 22, 2010
1,547
1
It would only run as fast as the weakest link. Is the FSB on 1333 MHz, or is that the rating Apple gave it because that was the fastest memory available at the time (the same way that they say it only supports 8 GB of RAM as that was the largest available at the time)? I think only apple's design engineers could tell us, unless someone is privy to the internal docs (as the processor most definitely supports it).
I so want 16Gb of 1600 now!!
 

daneoni

macrumors G4
Mar 24, 2006
10,803
79
I'm not trying to give you a hard time but that is not a good analogy. The system board does 'see' all the ram but Windows has problems with it.

Windows XP/Vista/7 32bit only will see 3.5 Gig

Windows 2003 Server 32bit (which uses an slightly modified XP Kernal) will see MORE than 4 Gig. No kidding...

So software and hardware viewing memory isn't a good analogy...
I'm not even talking about Windows, I'm talking OSX (which has been able to see/address more than 4GB since Panther) on Merom C2D MacBook Pros

Saw 4GB installed but never used the full 4GB...tapping out at 3.3 or so GBs
 

daneoni

macrumors G4
Mar 24, 2006
10,803
79
It was my understanding that the 2011 (and 2010 for that matter) MacBook Pro doesn't have a FSB.
Really? Is that even possible?
They don't. Memory is directly connected to the processors and not via FSB. DMI i think it's called for Sandy Bridge whilst Arrandale used QPI

Support for 1600MHz might come down to whether Sandy Bridg architecture supports it (it does). If so, then that feature likely carries over into the 2011 MBPs.
 
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