It doesn't really matter too much. Personally, I went with 2 1GB sticks of RAM. I made that decision mostly due to price. It turned out to be cheaper to go with 2x1GB rather than 4x512MB.
Why would you want to add more after you have 2GB? Windows won't know what to do with anything beyond that point, Unless you do some insane amount of video editing or something.
Why would you want to add more after you have 2GB? Windows won't know what to do with anything beyond that point, Unless you do some insane amount of video editing or something.
Windows 32bit sees about 3 or 3.2 Gb of ram. Windows 64bit sees 8 Gb I think. And yea, Any type of graphics design, video/audio processing/CAD, etc will use it.