MEMORY IN R710 QUAD-RANKED

AFTERNOON FOLKS, I TRIED TO DO AN UPGRADE IN MY R710, MY IDEA WAS PUT 8 MEMORY DIMM'S 8GB QUAD-RANK 8500 TO HAVE A 64GB CONFIGURATION, BUT JUST RECOGNIZE 48GB.

I TRIED TO READ THE HARDWARE OWNER MANUAL BUT THERE'S JUST THE POPULATION FOR DUAL RANK AND SINGLE RANK.

SOMEONE COULD TEACH ME WHICH IS THE CORRECT POPULATION FOR 8 DIMMS IN 2 PROCESSORS MODE?

I WILL REALLY APRECIETE YOUR HELP.

THANKS ALOT