noob question on RAM

[Steelman93]

ok...I have to admit I don't really understand RAM. I currently have 2 GB of PC6400 ram in my k9a2 and I am going to upgrade, but the board does not support DDR3 so I need to stick with DDR2. I can get 4GB (2 x 2GB) of PC6400 for about $45 or 4 GB of PC 8000 for $70. My question is…do I but the PC6400 and leave the existing 2 GB in or do I go to the faster speed but with less RAM?

As I understand all my RAM will run at the speed of the slowest installed so If I buy faster RAM I need to take the old stuff out which is why I am not sure which route I should take.

TIA

[3dfxrain]

I'd be patient and work on and chip away at something for faster speed and more RAM than previously.

[ozzy983]

Just a word of caution: some motherboards do not play nice with memory speeds higher than 1000mhz. I found this out when I got my hands on some 1066mhz ram (thank god it was free). It will work great up to about 990mhz, and then it just flakes out; no combination of settings will change that fact.