I've just checked for you. Please first check the full version you got.
N53Jf -> Max 8 Gbyte @ DDR3 1066 Mhz
N53Jg -> Max 16 Gbyte @ DDRR 1066 Mhz
N53Jl -> Max 16 Gbyte @ DDR3 1333 Mhz
N53Jn -> Max 16 Gbyte @ DDR3 1066 Mhz
N53Jq -> Max 16 Gbyte @ DDR3 1066 Mhz
For the N53Jf you only can put 2x 4 Gbyte mem strips.
For all the 16Gbyte slot versions of the N53 a maximum of 4 Gbyte is supported.
Hope it helps you in your journey. Good luck