As long as the specs are correct, brand of RAM makes no difference and does not affect your warranty.
Got a mail back from Crucial.
CT2K8G3S160BM sold on amazon and CT4949518 listed on crucial
is the same thing! I hope this puts the issue to rest. Seems like what we confirmed in the thread is true, Crucial just add different model numbers for exactly the same product. It's something a lot of companies do. Mind at ease now and also, it allows you to search for 'older' part numbers which may be cheaper
"Yes it is the exact same RAM as the one listed on our web site for the (27-inch, Late 2013) iMac.
The code on Amazon is the technical description of the part, this tells us the type of memory, density, form factor, that kind of thing.
The shorter code on our web site, uniquely identifies that part to your particular system (27-inch, Late 2013) iMac, and is used to guarantee compatibility."
i just ordered this ram and there are a few others in the reviews of it that are complaining of it overheating...im not taking any chances in my new 3,000 dollar imac thats on the way.
I have it sitting here on my desk waiting for the iMac to be delivered. Not sure what to do now. Will Crucial take it back if the RAM package isn't opened yet?
Where did you see those reviews?
Amazon.
I've also installed Crucial ram with the right specifications and everything seems to function all right.
To test my machine and added RAM I'll perform an Apple Diagnostic's test tomorrow and if it shows that it's OK I'll not worry about this issue anymore.
I've updated the original post with my conclusion.
Attached are pictures of the ram I bought from Amazon.com, Crucial.com and the stock memory that came in the machine.
I hope my journey helps others down the road.
If you look to the pictures, you'll see that the modules from Amazon are DDR3 and those from Crucial are DDR3L (L= Low Power), so probably the overheating is related to this diffrence.
I got my crucial from amazon and it's DDR3L
I got my crucial from amazon and it's DDR3L
Conclusion/Update Fri, Oct. 11:
My conclusion is that Tunabelly's software is not reading the memory temperatures accurately.
Seems odd to me that an iMac would have issues with 1.5V RAM when JEDEC's definition of the DDR3 standard says the voltage should be 1.5V. If a system REQUIRES 1.35V it should be labeled as DDR3L RAM.