Lenovo G580 ram help

[cpper]

Hi guys
I want to upgrade my G580's 4gb ram with another 4gb stick. Currently the laptop has this stick in it.
My local shop has more options, but two which are in my budget are the Kingston KVR16S11S8/4 and the Kingston KCP316SS8/4 . Looking at the specs, both are identical to my current ram.
What is the difference between the two ? Which one would be compatible with my G580 ?

 

[dm31st3r]

Both options you present are compatible and identical to eachother. I would recommend, however, to only use identical RAM units in both manufacturer and model #.