Help with upgrading RAM with stock RAM??

This is what cpu-z says about my current 4GB RAM



Same identical stick in slot 3

It says PC3-10700 but I've heard it would work with PC3-10600

I want to upgrade to 8GB and my mobo is a LGA775 (Don't know the model but it has a G43 chipset)
Those 2 sticks are in Dual channel (slots 1 & 3)

I want to buy two of these and put them in slots 2 & 4 for dual channel

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Please I'm a nub in PC upgrading and if it won't work can you link me to one that will?

RAM is so cheap nowadays and less than 4 months ago they were priced at $30/each lol.. so I might as will upgrade since I won't be getting a new PC in 4 years anyways

I have win7 x64 so don't worry about that  

Specs:

Pentium Dual Core E5700 @3.00 GHz
4GB DDR3 RAM
nVIDIA GT 430
Win7 x64