Sur les test de MacWolrd (ceux qui vendent toutes les upgrad) ils indiquent dans un tableau récap que c'est 3 barrettes max si on utilise des 16Go !
Extrait :
As originally shipped, Apple officially supported a maximum of 8 GB of RAM but third-parties discovered that the system could actually support 16 GB of RAM using four 4 GB memory modules. On December 4, 2009, Apple "officially" began supporting 16 GB of RAM as well. Shortly thereafter, third-parties determined that the system could, in fact, support 32 GB of RAM using four 8 GB modules. Finally, third-parties have been able to support 48 GB of RAM with three 16 GB modules