Hello I am going to buy these memories HYPERX HX316LS9IBK2/8 8GB (2X4GB) SO-DIMM DDR3L CL9 HYPERX IMPACT BLACK DUAL KIT for my hp 15-d012sv laptop.I open the laptop to see the memory that is currently installed and i found that there were smaller than the memories I want to buy!The question is that can some laptops have smaller memories? Please answer quickly!