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When I checked it on System, it says 8 GB RAM. But I wonder, if I put 16 GB of RAM in the two slots of my MacBook (2 8GB sticks) will it work?

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Some Mac's can utilize more then the official amount stated however according to EveryMac.com, the actual maximum amount of RAM a MacBook Pro "Core i7" 2.66 GHz 17" Mid-2010 can utilize is 8 GB.

I've found that information presented by EveryMac.com to be very accurate in this area and wouldn't waste my time or money trying to put 16 GB in this model MacBook Pro unless it can be corroborated by an authoritative source.

As mentioned in the comments by RedEagle2000, "Mactracker says the same" and they too are known for being very accurate in this area as well.

Also at crucial.com, from Micron Technology and one of the top Semiconductor producing companies in the world, the model you have can only take 8 GB.

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    MacTracker says the same. – RedEagle2000 Mar 24 '16 at 7:57
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I always used 16GB RAM even before OS X officially supported 16GB on laptop, and (1) I never had problems and (2) the OS did recognise and use all the RAM.

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  • While that may have worked for you in particular, nonetheless this will not work on all models! As an example, out of the 37 MacBook Pro models currently listed in Mactracker only 15, or 40.54%, can actually use more RAM then officially stated – user3439894 Mar 24 '16 at 8:23
  • I've had the same experience. If I were a betting man, I would guess that it can support 16GB, and that the EveryMac list still lists 8GB because they only list models as supporting 16GB if they have confirmed work with 16GB; it's probable they simply didn't have this exact model lying around, 4 years after it was released, when 8GB DDR3 SO-DIMMs became available. – Geoff Nixon Mar 24 '16 at 9:37
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I will add I currently placed 16gb of 2x8gb sticks in my Macbook Pro 6,2 i7 2.66ghz and it worked- however in a short time it gave kernel panics and shut off and on at an alarming rate. if you are going to try this successfully- I recommend trying it with TESTED ram first- which probably isn't easily done- but I seemed to narrow it down to quality of the RAM sticks I used. I don't have funds to toss in the trash to keep trying by buying CAMXposure

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