Originally posted by: billbillw
I upgraded my P4 2.4 (533fsb) system from a 845PE motherboard (4x AGP;single channel memory) to a 865PE motherboard (8x AGP; dual channel memory) and I saw my 3dMark03 score go from around 3500 to more than 5500. That is pretty significant. I think the real advantage is extra bandwith of the dual channel memory. Comparisons of 4xAGP and 8xAGP do not really show a noticable advantage to the 8x.
You would need a new Motherboard and another stick of memory that matches the one you have (assuming you have only one stick right now).
The newer board would also allow you to upgrade to a faster 800mhz fsb processor at a later date (if needed).