XPS 9550 - problems with memory upgrade

Hi, today I tried to upgrade RAM in my XPS 15 9550 from 16 GB to 32 GB - 2x16 GB HyperX Impact 2400 Mhz 14 CL and it doesn't work. At least it doesn't work in configuration I'd like it to work. I can't get it to boot when both new sticks are inserted. What is strange I works perfectly with one stick inserted but only in slot called "Dimm B" on motherboard. What is more weird it works fine when I put one old 8 GB stick + one new stick. To clear it out: DIMM B DIMM A WORKES
16 GB empty OK
16 GB 8GB OK
8 GB 16 GB OK
empty 16 GB Not OK
16 GB 16 GB Not OK

Obviously first I thought that one of the stick might be broken but it looks that both are fine. Doesn't matter which one I put in configurations described above it works in the way I wrote. Checked with BIOS 1.2.10 and with newest 1.2.13. Do you have any idea what might be wrong?

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XPS 9550 - problems with memory upgrade