Apple-Certified RAM?
There's one important thing, and only one important thing, about Apple-certified RAM.

If you:


Buy RAM that isn't Apple-certified
Install it (or have it installed by a non-Apple tech) in a Mac
Later have a (non-RAM-related) problem with that Mac and send it to Apple for servicing without taking out the added RAM


Then you may get a little love note in the box when it comes back:


  During the testing process, it was determined that a part Apple has not approved for use with your product resulted in your product's failure. When the part was removed, your product successfully passed all Apple diagnostic and reliability tests…
  
  Continued use of this part (or parts) may cause another failure or damage to your Apple product, which Apple will not cover in a subsequent repair.
  
  The part (or parts) that did not pass Apple's diagnostic tests for your product is identified below:
  
  &nbsp; &nbsp; &nbsp; __X__ RAM Memory
  &nbsp; &nbsp; &nbsp; _____ Other


And yes, I'm speaking from my own personal experience (part one, part two).