Hello. I am trying to upgrade my ram. I have 4 slots. 2 are empty. Currently it runs on 2 sticks of 2GB DDR2 400Mhz. I wanted to just double it by adding what I already have in there but I guess the 400Mhz speed DDR2 ram is beeing phased out because I could only find one type of ram that speed and it was 2 sticks of 1GB ram. I know I can't jump up to DDR3 but if I do away with what I'm currently running on can I upgrade to DDR2 1066Mhz ram?
Also, I found this odd. I ran Speccy on my computer to find out what I have in there. Websites and forums are telling me that DDR2 400Mhz is PC2-3200. However, Speccy tells me that my sticks are PC2-6400. I don't really understand what the PC is about. However is seems that most PC2-6400 ram is DDR2 800Mhz. Does this mean that my 400Mhz might be able to run with 2 other sticks of 800Mhz DDR2? If so, do all the sticks need to be the same number of GB?
Also, if I did just go with the 2 1GB sticks of DDR2 400Mhz, can that run with the ones I already have in there even though they are different number of GB?
Thanks for your help!