It's not true. There are agp versions of both the HD3850 and HD4670. Those would be wasted on a Pentium 4 however and the HD3650 would be a more appropriate choice for this guy.
so the newegg website graphic cards work on my comp?? install it at the brown slot?? and remove the green graphic card at the white slot??
does that graphic card in newegg sell in singapore??
I believe you do not actually have a graphics card at the moment and are using the integrated graphics built into your motherboard. You can be sure by looking to check if the monitor is plugged into that "green card in the white slot." If it's not then that's not a graphics card, it's something else like a sound or network card and should be left in your computer.
I don't believe Newegg ships overseas so you'll have to find some place that sells to your area.