Getting more ram question

In my desktop, I currently have 2x4GB sticks of ram http://www.supertalent.com/datasheet..._Datasheet.pdf . I would like to upgrade and get some more ram and found something cheaper than the ram I have. I would like to know if the two are compatible and if I should get it. I am getting 2x4GB kingston hyperX genesis, here it is on amazon http://www.amazon.com/dp/B0037TO5C0 and here are the kingstons specs http://media.kingston.com/pdfs/HyperX_Genesis_US.pdf . (P.S. there are other people that have different specs for this particular ram stick)

Thanks for your time and help! :D