kaz
right here
I had purchased a Crucial 4GB DDR3 memory module for my DELL Inspiron 14 5447 laptop to make it to total 8GB.
No problems,no issues,functioning normally.
Just ensure that the RAM module voltage specs. matches with that of your DELL XPS 15 laptop.
1.35v == 1.35v RAM module
1.5v == 1.5v RAM module.
One will not run in mixed voltage mode in case of Laptops .
Thanks bro.. I already got the Transcend one..