RAM not working

[AskingForAFriend]

I've bought some new RAM for my PC to finally use dual channel, but it's not working. I'm using some bear bones SK Hynix 2133P RAM (both modules) and they're similar enough. The new module won't work; not in dual channel or even stand alone. I've reset the CMOS with the new RAM in and no success. What can I do? Is there some special setting for my MOBO that will allow it to work? Z170-P and an i5-6500. 

 

Working Module:

8GB 2Rx8 PC4 2133P UBO 10

HMA41GU6AFR8N TF NO AC  1535

 

Non Working:

8GB 2Rx8 PC4 2133P REO 11

HMA41GR7AFR8N TF TD AD 1711

[Razor Blade]

Appears that the working stick is unbuffered and the non working stick is registered. You can't mix them and if your motherboard doesn't support RDIMM that would explain why it won't work even by itself.

[RedAV8R]

Similar enough...Um... Nope.

 

The one not working is ECC/Registered.