I have seen the odd instance where two different brands of RAM did not get on together. Although this is pretty rare, it`s worth bearing in mind.
I would compare the price of generic RAM and Samsung RAM, and if there`s not much difference in price get the Samsung so at least they match.
Whatever you get,I`d make sure you match the bus speed cos a mismatch here can cause problems.
Hope this helps
_________________________
...
Just because I don`t care, doesn`t mean I don`t understand