128GB (4 X 32GB) DDR3 for Apple Mac Pro 2013 MacPro 6,1 Memory Ram Upgrade Kit
Yes, you read it right. Mac Pro 2013 6,1 can run with 128GB memory. Please note that although this kit is 1333 memory, on Mac Pro 6,1 it will run at 1066MHz. It's now like 64GB memory who can run at 1666MHz.