Late 2013 - MacPro6,1 (6-core)

Compatible Upgrade for: MacPro6,1 - A1481 - EMC - 2630   Six Core 3.5GHz 
  How to find Model ID   Installation videos
Standard Memory: 16 GB 1867MHz 
Maximum Memory 128 GB
Note:

16 GB of RAM was installed as four 4 GB modules. By default, one slot is free.
*Apple formally supports 64 GB of RAM in this model, but third-parties have determined it can support 128 GB of RAM.

The following items are also compatible with this product...............................
External Hard Drives Battery SSD Storage Cards
Privacy Preferences