Yes that one does. Likely not going to fit in the R7 case. You would have to check the dimensions and if they fit as Alienware systems are OEM and not necessarily confirm to the ATX standards.
How to enable 64gb reserved for use total 128 please when i hvae watch before purchass the ram  that say my processor support 128g why the system reserver 64      
Aurora R7, 4x32GB 2666MHz, 64GB reserved