I feel guilty for even suggesting you sink money into a rig of this vintage..............but:
1) SImply changing your memory from PC2700 to PC3200 won't improve the situation, however, upgrading to at least 1 gig total will certainly help. You can go to 2 gigs, but with XP, it might not make much of a difference, and you will be at a dead end. That memory can't be carried forward to a new build/system.
2) A worthy upgrade. The only compatability question is whether your motherboard AGP slot is 1.5V or 3.3V. That slot in the videocard determines that.http://en.wikipedia.org/wiki/Accelerated_Graphics_Porthttp://www.ertyu.org/steven_nikkel/agpcompatibility.html
Easiest way is to pull out your current videocard, see if those slots are the same, look at the AGP slot on the motherboard and see if it has any dividers that get in the way of your new card.
3) I don't know who told you you need a 450 watt PSU for this. That card is within about 10-20 watts at load of your current videocard. I wouldn't even worry about a new PSU at this point unless I had problems. I doubt that whole rig pulls 180 watts maxxed out.
Edited by dpunisher, 16 July 2010 - 11:29 AM.
I am a retired Ford tech. Next to Fords, any computer is a piece of cake. (The cake, its not a lie)
3770K @4.5, Corsair H100, GTX780, 16gig Samsung, Obsidian 700 (yes there is a 700)