Macbook Pro Mid 2012 DOES NOT read 16 gb of ram.

steveo_knievel2

macrumors newbie
Original poster
Jun 26, 2017
2
0
Hello all. I have a 13 inch, mid 2012 macbook pro. I grabbed 16 gb ram that fits my system off of amazon to upgrade from just having 4 gb. I installed and I know I did it correctly because it reads both 8 gb sticks but reads them as 4 gb sticks. Is there anything to do be done about this? could it be the brand? could my system just not be able to more 8 gb? somebody please let me know, I appreciate you in advance!

P.S. The brand that I have is A Tech
 

Nermal

Moderator
Staff member
Dec 7, 2002
18,678
1,183
New Zealand
Interesting; I'd never tried to upgrade my MBP past the documented specs. Which is actually a bit odd because meanwhile my desktop is absolutely not in any sort of officially-supported configuration!
 
  • Like
Reactions: macintoshmac

treekram

macrumors 68000
Nov 9, 2015
1,849
401
Honolulu HI
I have the 13" mid-2012 MBP and it definitely can take 16GB of RAM. There are many other 2012 MBP owners that have 16GB RAM in these forums (well, they say they have 16GB). The RAM likely got mis-labeled or something isn't working correctly in your MBP. In the system report, there usually is a part number (it's usually quite long and those that I have seen starts with "0x"). Try searching for this part number and see if it corresponds to a 8GB or a 4GB module.
 
  • Like
Reactions: keysofanxiety

macintoshmac

macrumors 68040
May 13, 2010
3,052
2,640
Hello all. I have a 13 inch, mid 2012 macbook pro. I grabbed 16 gb ram that fits my system off of amazon to upgrade from just having 4 gb. I installed and I know I did it correctly because it reads both 8 gb sticks but reads them as 4 gb sticks. Is there anything to do be done about this? could it be the brand? could my system just not be able to more 8 gb? somebody please let me know, I appreciate you in advance!

P.S. The brand that I have is A Tech
Would you be kind enough to post exact specifications of the said RAM? If possible, also photographs of any stickers on the RAM? Prima facie, you have bought yourself incompatible, incorrect RAM.
 

robvas

macrumors 68030
Mar 29, 2009
2,801
371
USA
I've never heard of a MacBook only recognizing half the RAM. It either works, or beeps and doesn't boot up at all.
 

chrfr

macrumors G3
Jul 11, 2009
8,183
2,514
Hello all. I have a 13 inch, mid 2012 macbook pro. I grabbed 16 gb ram that fits my system off of amazon to upgrade from just having 4 gb. I installed and I know I did it correctly because it reads both 8 gb sticks but reads them as 4 gb sticks. Is there anything to do be done about this? could it be the brand? could my system just not be able to more 8 gb? somebody please let me know, I appreciate you in advance!

P.S. The brand that I have is A Tech
You definitely have incompatible RAM. Return what you have.
 

muratura

macrumors member
Mar 20, 2017
40
29
Can you try to boot a Linux stick or a Windows bootcamp? I don't remember exactly but some macs do not see in MacOs all the ram, while in Linux/Windows they can. But I think this applies to older machines, like 2010 or 2011 15 inchers
 

Samuelsan2001

macrumors 604
Oct 24, 2013
7,682
2,103
Hello all. I have a 13 inch, mid 2012 macbook pro. I grabbed 16 gb ram that fits my system off of amazon to upgrade from just having 4 gb. I installed and I know I did it correctly because it reads both 8 gb sticks but reads them as 4 gb sticks. Is there anything to do be done about this? could it be the brand? could my system just not be able to more 8 gb? somebody please let me know, I appreciate you in advance!

P.S. The brand that I have is A Tech
Sounds like they sent you 8gb labelled as 16gb if it is reading both sticks then 8gb all the ram you have installed. The 2012 13 inch MBP can handle 16gb many people have done this upgrade no troubles at all, return the RAM you have and order crucial RAM that always works just fine (barring faulty RAM of course)
 

macintoshmac

macrumors 68040
May 13, 2010
3,052
2,640
I have 16GB DDR3 1600MHz on my Late 2011. Though that is the 15" but there is no reason why 2012 13" ones with Ivy should not handle 16GB.
 

macintoshmac

macrumors 68040
May 13, 2010
3,052
2,640
The spec sheet can say whatever it wants, the mid-2012 is definitely capable of running 16GB. OP just happens to have either incompatible or faulty sticks.
True. Spec sheets say 8GB for 2011 models too, but I know mine to be running 16GB 1600MHz just fine.
 

New_Mac_Smell

macrumors 68000
Oct 17, 2016
1,914
1,491
Shanghai
Macs tend to be quite picky on what RAM they like. It's always best to get a brand that's known to work than just get the cheapest available and hope for the best.

If you can't test it in another device to check it is actually 16GB then return it and assume it's incompatible.
 

ZapNZs

macrumors 68020
Jan 23, 2017
2,310
1,150
  • Does the sticker on the DIMMs themselves say the correct specs for your machine? (ex: 8GB/1600MHz/1.35v)
  • Have you tried each RAM DIMM individually in each slot? (to verify that each DIMM works as does each DIMM slot and to ensure each DIMM is actually 8 GB)
  • Have you performed the Apple Hardware Test?
  • Did the RAM come from Amazon directly (i.e., NOT 'Fulfilled by Amazon') since there are so many active memory scams that Amazon has failed to do anything about?

Provided there is nothing wrong with your MBP's logic board, you may want to try returning the A-Tech and purchasing Crucial RAM. Their memory finder shows the compatibility:

Screen Shot 2017-06-26 at 12.33.39 PM.png

Screen Shot 2017-06-26 at 12.33.55 PM.png

Screen Shot 2017-06-26 at 12.34.18 PM.png
 
Last edited: