With most Macs these days, soldered memory chips mean that whatever RAM you want, you have to buy it from Apple when you order the machine. But the new 27-inch iMac still uses plug-in RAM, so you’re free to add your own RAM after purchase. And while Apple limits you to a maximum of 32GB, OWC (just like in years past) has just announced that it will shortly offer upgrade kits for 48GB and 64GB RAM …  expand full story