DDR3 4GB Ram Upgrade for DELL Inspiron N5010.

Hi,
I want to upgrade my dell inspiron 15R N5010
Stock configuration: 3gb ddr3 to 2+4 GB ram.
Tried crucial 4gb 1600mhz 1.35v did not work.

after talking to dell support only 1333mhz with 1.5v only supports.

removed>