DIMM configuration R730XD

Hi all,

We have r730XD boxes with 1 CPU and 4 existing 8GB DIMM modules, 1 in 
each channel. We want to add 3 16GB DIMMS. Reading this documentation, 
this should be possible:

http://www.dell.com/support/article/us/en/04/SLN294489?c=us&l=en&s=bsd&cs=04

How should we add these: Should we have 3 x 16GB + 1x8GB in the 
first/white slots, and 3x 8GB in the black, or not?

Thanks in advance!

Kenneth