Your Mac Pro has 4 slots and the maximum possible upgrade is 128GB (4x32GB). Total Capacity: 128GB. Ram speed is limited to 1066Mhz. INSIDE YOUR MAC PRO 2013.
Samsung 128GB (4x32GB) DDR4 3200MHz ECC Reg Server RAM Kit M393A4G43AB3-CWEGY
Lexar UDIMM DDR4 RAM 8GB 3200 MHz, 288-Pin Desktop Memory, RAM Module Upgrade
32 GB RAM (2 x 32GB) DDR4 2666MHz SODIMM Laptop Memory RAM - 64GB Kit
Kingston 16GB 2X8GB DDR3 2RX8 1600MHz PC3-12800S 204pin Laptop Memory RAM 1.5v
Lot For Samsung 8GB 4GB 2GB PC2-6400 DDR2 800Mhz CL6 SODIMM Laptop Memory RAM &N
Hynix Chips 4GB 2X 2GB 2G PC2-5300S DDR2 667Mhz 200PIN SODIMM Laptop Memory RAM
