How much RAM can I install in my Macbook Pro?

Yes.

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See this to locate installation instructions: How to remove or install memory.

Crucial and OWC.

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Installing RAM in a 2011-2012 MacBook Pro

There is really only one way to install RAM into a 2011-2012 MacBook Pro and while there are hundreds of DIY videos online, I just like this one, found on YouTube, by “macmixing”.

Note that there is a difference in the RAM that should be used in 2011 and 2012 models.

2011 models must use:

•204-pin PC-10600 (1333 MHz) DDR3 SO-DIMM

And 2012 models must use:

•204-pin PC3-12800 (1600 MHz) DDR3 SO-DIMM

So here's the video:

Remember that the 13", 15" and 17" 2011 models (early or late) and the 13" and 15" mid-2012 non-Retina models can handle 4GB, 8GB or (unofficially, but, believe me, it works) 16GB of RAM. There are, in my opinion, only three 100% Mac-compatible vendors out there: Corsair, Crucial and OWC. I really can't recommend any other brands, even though it may work, as these are the only brands that I've personally used in quite a while. Also remember to stay away from any RAM that is a “value” brand - Macs are picky about RAM and often these value RAM modules just don’t work very well.

Good luck,

Clinton

Does anyone know about 2 specs that I have read about. 1st. is that 1.35V should be used over 1.5V. Second is that CL9 (CAS Latency 9) is faster than the CL11,CL10 that some of the links on the forum have directed me too.

I have my eye on the Kingston hyperX 16GB ( 2X8GB 204pin DDR3 SO-Dimm DDR3 1600 (PC3 12800) laptop memory model KHX16LS9P1K2/16. It was rated best on some of the electronic reviews.

http://www.kingston.com/dataSheets/KHX16LS9P1K2_16.pdf

I have a mid 2012 macbook pro 9.1 (no retina) i7 DDR3 1600 PC3- 12800 SO-Dimm

Thanks,

Joe

Ages ago I used Kingston RAM - but I had some problems with some sticks back in the day so I stopped buying it. That's not to say that the current crop isn't good... I just don't know of many Mac users that use it.

I don't know how much that RAM kit is, but if I were you, I would certainly take a look at Crucial (what I use) or OWC. Haven't heard a lot, lately, about Corsair, but if you look at their RAM, make certain that you get that labelled "Mac Memory."

Good luck,

Clinton

Make sure when buying a 16GB kit, it is supported for mac. And make sure you clean out computer too when installing it, it can cause some problems otherwise.