So the apple website lists the base 3.4gHz 27" iMac as only configurable up to 32GB of RAM, while the mid-level and high-level 5k iMac support up to 64GB of RAM. I remember reading somewhere though, that people have placed up to 64GB into the base iMac regardless of what apple lists and that it worked. Does anyone know if this limitation is real or some artificial limitation that you can actually work around? I wouldn't find it hard to believe that apple would list it like so, in order to encourage purchase upgrades above the base 5K iMac. For reference: I have ordered the base 3.4gHz 5K iMac and have 16GB (8x2) of Crucial RAM on back order. In the case that the base iMac is configurable above 32GB, I might consider ordering 32GB (16x2) of Crucial RAM instead for a total of 40GB (when paired the the 8GB (4x2) provided by apple).