memory - How can I find out which type of RAM I need for my laptop?

I just bought an HP Laptop at Fry's and it has 6 GB of memory. I want to upgrade to
8. The problem is that I don't know exactly what I need. I know it has 2 slots (Dual channel)

and it's DDR3.

I don't know if it is SODIMM, or how many pins it has or MHz.

I have posted some specs about my laptop:

What exact type of RAM do I need?

Answer

Any 204 pin DDR3 1333 will work. I use 2 of these in my system.

You probably only need one chip. I would double check your notebook that it has a 4gb and a 2gb and upgrade the 2gb one.