I realize there's new iMac's coming on the 30th of October but I wanted to check that it is possible to upgrade the base spec iMac to 64GB of RAM? As the option to spec it on Apple's website only goes up to 32GB, I'm assuming though that there should be no issues in manually upgrading to 64GB? Looking to purchase around 16 machines, so small costs do add up. Will of course be spec'ing them with SSD's. Base CPU will be enough but large amounts of system memory are paramount.