RAM UPGRADE HELP

[legend1234321]

i want to upgrade the ram of my current laptop, its a 64bit, windows 7 with 2gb base ram and 8gb max, these are its current ram specifics:

1 2 GB SODIMM Other 1067 MHz Samsung
2 Empty DIMM Other 1067 MHz

I am completely new to the concept of upgrading ram, so i dont really want to take out the 2 GB already in there but is it possible to load a 4 GB on top of it making the ram 6 GB
this i what i am currently looking at http://www.upgradeable.com.au/parts/UH1492.html

any help is well appreciated

Edit:
Its a hp g62-456tu and the current memory module in it, states "replace with hp spare" does this influence the choosing of an upgrade at all

 

[sharkbyte5150]

http://www.memorystock.com/memory/HewlettPackardCompaqG62456TU.html

 

[nikorr]

Hi there,

U need ...

Compaq G62-456TU Memory Specifications
Standard Memory 2GB (Removable)
Maximum Memory 8GB
Memory Expansion 2 Sockets(2 banks of 1)
Memory Comments PC3-8500 DDR3 SDRAM SODIMM 204 pin memory

The one u have selected is DDR3 PC3-10600 1333Mhz 204-PIN SODIMM
--------------------

What stores u can buy it in AU? U will get a better price there.

U can search for any of these.
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100007609%20600006178%20600000401%20600000445&IsNodeId=1&name=DDR3%201066%20%28PC3%208500%29