Can i use two different ram memories ?

Solution
The results of mixing RAM sticks not bought as a kit are undetermined - they may work fine or not at all. And there is no way to tell before you try mixing them. Specs of those two you linked are close enough to give you a fair chance of working, but far from 100%.
The results of mixing RAM sticks not bought as a kit are undetermined - they may work fine or not at all. And there is no way to tell before you try mixing them. Specs of those two you linked are close enough to give you a fair chance of working, but far from 100%.
 
Solution
MERGED QUESTION
Question from thatmoritryhard : "Dual channel with a mix memory set ?"










A matched set = 2 (or 4 )sticks of ram, sold in the same package. matched at the factory and guarantied to work together.