[NAME] I will say that it has been reported in this forum that configurations other than the ones listed by Dell work. The odds that 2 x 16 GB will work are in your favor. My XPS 8910 came with 1 x 16 GB (not listed in the original Dell memory configuration matrix) and I added another 1 x 16 GB (also not in the configuration matrix) and it worked fine. 
XPS 8930 should support 32GB configured as 2x16GB sticks in slots 2 and 4 (DIMM #1 and DIMM#2, respectively), correct?   Asking b/c the memory configuration matrix I've seen for this PC only shows 4x8GB sticks for 32GB. The only configuration listed using 16GB sticks is 64GB.
XPS 8930 2x16GB in slots 2 and 4 (DIMM #1, DIMM#2) should work fine, correct?