Right Memory Ram for MacBook pro 15” 2011

[Jerezanito]

I need to upgrade the memory ram but the memory that is already installed is Samsung 2x2 4gb pc3 10600, some people are selling at craiglist hynix 2x4 8gb pc3 12800 I’m confuse because some reviews at differents webs people are commenting that 12800 are ok for this model and some people say no 10600 is the right one please help me with this thank you

 

[Audit13]

Normally, DDR3 1600 (PC3 12800) memory will run at DDR3 1333 if that is the maximum speed supported by the chipset. I have personally used Crucial and Kingston DDR3 1600 in a 13" early 2011 MBP.

Stay away from DDR3L memory unless that memory can run at 1.5v too.

 

[Jerezanito]

Normally, DDR3 1600 (PC3 12800) memory will run at DDR3 1333 if that is the maximum speed supported by the chipset. I have personally used Crucial and Kingston DDR3 1600 in a 13" early 2011 MBP.

Stay away from DDR3L memory unless that memory can run at 1.5v too.

Can I use pc3 12800 with out any problems?
Basically is the same ?

 

[MSastre]

Crucial has info on just the exact memory your machine uses. Just tell them what Mac you have.

 

[Audit13]

I have used Crucial and Kingston PC3 12800 on a the early 2011 13" MBP which takes PC3 10800. Even though the Apple specs say it should be PC3 10600, PC3 12800 works perfectly. No errors, no crashes. I believe you will have a similar experience with you 2011 15" MBP.

There's always a chance that the PC3 10600 you buy from Craigslist won't work but, if the RAM is fully functional, the chances are low that it won't be compatible.

Hynix memory has been used in several MacBooks that I have upgraded.