I'm thinking about upgrading my VAIO Desktop, and feel I could do with some extra RAM. Here are the current default factory specs: http://support.vaio.sony.co.uk/tutorials/memory/memory.asp?site=voe_en_GB_cons&c=1&s=PCV-RZ&m=1461 Sony VAIO PCV-RZ504 Memory Installed Slot1 : 512 Mb Slot2 : 512 Mb Slot3 : Empty Slot4 : Empty Maximum Memory 2048 MB Memory Type DIMM - 400Mhz (DDR) What are my options? And what checks do I need to do? I have four slots, and I am considering utilising them all to their maximum if possible. What benefits will I see as a result of upgrading?