It has become a fairly openly discussed problem recently, that it is more or less proved through repeated attempts and repeated communications, that the OWC NuRAM (although it physically appears to comply with specifications supplied by Apple) simply will *NOT* work properly in the 2010 iMac range with the 4x4GB (16GB) configuration. Those of us who have tried it are plagued almost immediately with random, spontaneous shutdowns. The problem is solved simply by stepping down to 12GB of NuRAM, or trading the NuRAM for the better OWC RAM or the Samsung memory sold by OWC. But here's the hilarious thing, the thing you're not going to believe: Apple has started looking up the phone numbers of people who have complained about this issue...and they are just out of the blue cold calling them to see if there is anything they need to do. So far two of us at the Apple Support forums have been called out of the blue to see what can be done. Nothing needs to be done for me, because I have already gone with Samsung and given back the NuRAM, and stepped down to 12GB just to be safe. But the other guy who is still having the problem has just been offered a remedy by Apple and given a case number. Can you freaking, bloody believe that in 2010 in America, we are dealing with a company that will still go that very far out of its way with proactive solutions to issues like that? I'm telling you...I think I'm sold for life.