Hi all, I am looking for a memory upgrade for my partner's iMac. It is surprisingly hard to find. What I find is either 240-pin (it has to be 204 according to Apple) or terrifyingly expensive (198 euro for 4 GB?!) Is it possible to replace the current 4 GB 1333 MHz with a set of 2x8GB 1600 MHz? Will they work, just slower than they potentially could? Or will they not work at all? Thanks in advance for any responses!