<p>That means that out of the two slots available each currently has a 2GB stick in it. You can, down the road, replace one of the 2GB w/a 4 GB stick and thus give you 6GB…or any combo you like up to a maximum of 8GB in each slot. You just need to be sure you buy the proper “type” memory (in this case DDR3). Only downside is that you have to dump a 2GB that you already paid for.</p>
<p>If this is a Dell unit you can always chat with them online and they can answer any other questions or call Toshiba (etc.) if your unsure.</p>