Originally posted by deadandbrok3n
does it have to be the same Cas Latency of the same ram got in there now ??
It doesn't have to be the same BUT usually for best performance, you want to run all the same modules if possible. That is why most prefer buying the RAM kits. Don't know how this will work out but you could do a 2GB kit that uses two 1GB modules and a 1GB kit that uses two 512MB modules. That way you would be taking advantage of the 3GB Win XP limit. Of course, most people find 2GB of RAM to be more than enough. Now if you are doing CAD, then by all means max out the RAM.