First check you have the Ultra 400 version of that board and can support the XP3200+ Barton (400 bus) chip. If not, you may top out at an XP2800+ or 3000+ (333 bus)
Second, I have a Soltek SL-75FRN2-RL NForce 2 Ultra 400 mobo, XP2500+ Barton and GF4 Ti4200 128MB 8X. It scores 12123 3dmarks in 2001se benchmark without any overclocking. If I overclock to a XP3200+, it scores 13024 for a 900 point gain. I suspect if you can use an XP3200+ you would get about a 900-1000 increase. This would be a bigger increase if you were using a faster videocard. I used the the NVidia 4403 drivers for this testing, which score higher than other versions. In the same system the XP2500+ and a Radeon 9800 non-pro scored over 15,100 3dmarks without overclocking, and over 17,500 when overclocked to an XP3200+.
Third, IMHO, I think an XP2400+ or XP2500+ is a great match for a Ti4200. They combine for as much gaming bang for the buck and are a great value. Unless there is a reason besides gaming that you need a faster CPU, or you have use for the XP2400+ in another build, It doesn't make much sense to me to spend $200+ on an XP3200+ and keep the Ti4200+. A Radeon 9800 or FX5900 will give you a better fps increase for the $200+ bucks. Unless of course a video card upgrade is in your near future too. Anyway, this is just my opinion. Although an overclocked XP3200+ and overclocked Ti4200 combo can be quite fast, the ti4200 will be whats holding you back in games, especially future games.
Hope this is helpful.?
ABIT IS7, P4 2.6C, 512MB Corsair TwinX PC3200LL, Radeon 9500 Pro, Santa Cruz, Antec 1000AMG, TruePower 430watt