High Density ram problem

I have just built a pc but the ram I bought does not work. I just noticed this on the online listing
‘confirm compatibility with your system as high density 128x4 memory is not compatible with some motherboards/chipsets’
and wondered if this was why? I am using this motherboard.

I’d like to know if it’s dodgy ram or if I’m just stupid before I try sending it back.

Thanks in advance!