Mid-2012 - MacPro5,1 (4-core)
Compatible upgrades for: MD770LL/A, MD772LL/A - Mid 2012 Mac Pro's.
Standard RAM: 6 GB (8GB - Server)
Maximum RAM: 48 GB**
Details: 6 GB of RAM is installed as three 2 GB modules. One slot is free.
**Apple officially supports 32 GB of RAM. However, this model actually can support 48 GB of RAM.
RAM Slots: 4*