56GB (3x16GB)+(1x8GB) Memory Ram For Apple Mac Pro 4.1 2009 Quad Core All CPUs
Your Mac Pro has 4 slots and the maximum possible upgrade is 56GB (3x16GB)+(1x8GB) or 64GB (4x16GB) depending on what CPU you have installed . Kit Capacity: 56GB. INSIDE YOUR MAC PRO QUAD CORE. Quad Core Model: 2.66Ghz / 2.93Ghz / 3.33Ghz.