its not a problem and with this version of windows 7 i can only carry 8 Gb....
Have 6 but also have an old base unit with 2 x 1Gb sticks.. opened up the new (15 month old) unit today hoping to see 4 ports for RAM, alas, only 2, and not worth buying 2 x 4 gb sticks for what i do... hence wondered if you could expand the slots as per USB's...