Mid-2011 - iMac12,1
compatible upgrades for : MC309LL/A, MC812LL/A, BTO/CTO 21.5-inch
Standard RAM: 4 GB
Maximum RAM: 32 GB*
Details: By default, 4 GB of RAM is installed as two 2 GB SO-DIMM modules. Two slots free.
RAM Slots: 4
*Officially, this model supports four 4 GB modules -- one in each slot for a maximum of 16 GB of memory. However, third-parties have discovered that it actually will support 32 GB of memory using four 8 GB modules.