My wife currently has 1GB RAM in her Pentium D computer. I am interested in maxing out the RAM for her, but have questions as to the type of RAM I can install. I used Crucial scan to determine that I can expand her from the Current 1GB to a max of 4GB. There are 4 slots and she currently has two 512MB sticks in place. According to Crucial, both PC2-5300 and PC2-6400 RAM is compatible.
I have two sticks of PC2-5300 already and found somebody locally that will sell me two sticks of PC2-6400. I'm just not sure it's a good idea to mix them. Is it important to keep all RAM installed at either PC2-5300 or PC2-6400?
Also, I might only be able to buy one stick of PC2-6400 from this guy. If so, can I install two sticks PC2-5300, one stick PC2-6400 and leave one of the 512MB sticks in the fourth slot?