Sorry to hop back into the middle of a thread here, but I've been scouting memory a bit. OWC's prices are good, but their shipping to Canada is a bit crazy. I checked out CanadaRAM.com. They're prices are all over the board. For 16gb kit they list Kingston ($490), Certified ($229), Corsair ($145), and Mushkin ($144). I'm assuming "Certified" is actually a brand name in this case. Sooo... which ones would be considered equivalent to "Apple Certified" RAM? Is the dirt cheap Mushkin going to work ok? In looking around, the only difference I've been able to find with the "Apple Certified" ram is that it has a bigger heat shield on it. I'm not sure if that's true or not. Is "Apple Certified" RAM necessary? I've never had a RAM issue on a plethora of PC's I've built. Is it more likely to crap out in a Mac? Thanks for any enlightment.
I've heard the statement that "Macs are picky about RAM" in the past, and in my opinion, that may have been true when Macs were using more obscure hardware (in other words, PPC motherboards and chipsets), however, I see no reason why a modern Intel-based Mac would be any more picky than a comparable Windows machine. As a matter of fact, Apple often uses the major OEMs like Foxconn, ASUS, Pegatron and others to assemble their boards, right along side boards for major vendors like Dell, HP, etc..
With that said, I am a big believer in buying name-branded memory from a reputable vendor that will be around long enough to honor the "lifetime" warranty. Memory issues can be tricky to sort out and can manifest themselves in a variety of different ways - everything from kernel panics to seemingly random instability.
For that reason, my recommendation is to stick to well-established vendors with a proven track record or decent customer support. Mushkin, Samsung, Micron (i.e. Crucial), Kingston, Corsair, etc should all be good bets. I see no reason why you have to seek "Apple certified" memory - particularly when Apple uses many of those brands as OEM installs.