Azam Azri :
Itmoba What About Pin I really not understand
Sorry I am Newbie Here
Like I said before, it's not a good idea to use different RAM modules, even if they're similar. The best thing you can do -- which is also what you should do -- is to buy all of the modules needed in one pack. This means not buying one stick and another stick. You want to buy both sticks at the same time which comes in the same package. This ensures that the two are perfectly compatible with one another.
I suggest you buy your new RAM and sell your old RAM.