Ram update requires 64bit OS?
My Dell D820 laptop has 2 GB ram (2x1GB). I wanted to update to 4 GB (2x2GB), but when I was looking around newegg, all the reviews were talking about 64 bit OSes being necessary. Is this true? Why? If I buy 2 2GB sticks and throw them in, will it just not use all the memory or will it not work at all? Is there any reason to or to not upgrade to a 64 bit OS? I thought you only needed and could only use a 64 bit OS with a 64 bit CPU...