Mid-2010 - MacPro5,1 (4-core)
Compatible upgrades for: MC250LL/A, MC915LL/A - Mid 2010 Mac Pro's.
Standard RAM: 3 GB
Maximum RAM: 48 GB*
Details: By default, 3 GB of RAM is installed as three 1 GB modules. One slot free.
*Apple officially supports 16 GB of RAM in this model, but it actually could support 32 GB of RAM. Later, third parties bumped this unofficial maximum RAM to 48 GB.
RAM Slots: 4*