Hello, Are these RAM sticks a good buy for a 2017 27 inch iMac 5k? Corsair Vengeance Performance 2x 8GB (16GB) SODIMM 2400MHz I just want to be sure before ordering. Apple chat said NO.. ? And I think iv'e seen these sticks being used pretty much on big channels on youtube? Or are these bad? The help would mean a lot! Thanks!