Hello,

Had this problem also. Solved yesterday. i9900k/ 64GB corsair 3200 ram. 

What I did. 1:Unplug and discharge power. 2: Remove CMOS battery for reset. 3: Installed 3 x 16gb sticks in the two white slots and the black in the middle of the two whites. 4: reinstall CMOS battery and power and bootup. System restarts a few times by itself and boots up with 48gb ram at XMP 3200. 5: Noticed there is an intel chipset driver update in the DELL driver area and install that. 6: Power down and discharge power. 7: Install last stick on the last slot closest to the CPU. 8: Boot and voila! 64GB running at XMP 3200.

Not sure if it was the chipset driver that made the difference or the install order of the sticks, but it works great now!

Cheers

Opps, cr2032.

One white one in black just means it's running in single channel mode.  Not as good. 

Try clearing cmos by removing the  cr203e battery out of mobo.

Online reseller in new packaging and unopened. Looks completely legit and shows everything correctly in CPU-Z

Thank you I will try this

clear cmos.

check each stick one at a time including going into cpu-z and reading the SPD.

Then use 2 pieces in the first bank aka White Ears.

The order is 1 then 3         2 then 4

Not 1 then 2    3 then 4.

Try 1 then 3

Then add one stick in slot 2

then add the last stick in slot 4

DELL uses 1.4v XMP profile.

Mixing Density and Vendor and Speeds is not recommended.

Start with one then add another until all the slots are filled in the correct order

The other Really Bizarre thing is the labeling of the Ram slots.

Note the Wonky PairsNote what I would say is 3 is actually 1

I have the same problem. Does your system run stable with the memory? If I use the AWCC for overclocking CPU, also RAM settings are changed with lead to this RAM problem.