I have a four year old Asus CM5570 running 64 bit Vista with a Pent. dual core 2.6 ghz CPU. It has four memory slots with three being used, one vacant. Each of the three slots has a 2 Gig DDR-2 stick running at 800 Mhz that came with the computer. The motherboard supports four gig stick 800Mhz per slot for a possible 16 gig of RAM total.
The computer runs fine, but looking forward, I think I'd like to maybe upgrade the DDR-2 ram now rather then later. My thought was to at least add one stick of 2 gig ram to the existing vacant slot. My question is, can I drop in a 4 gig stick of DDR 2 800 Mhz, giving me a 66% increase, without touching the existing 3 slots of 2 gig each?? Do I need to get a pair of 4 gig sticks to get it to work?? Thanks.