Your MSI KT3 ultra does not have pci/agp lock, and it only has a vcore of up to 1.7v. It is "ok" for light overclocking. But you will be running your pci/agp out of spec unless you use a high multiplyer which I believe the xp2400 does have accessable. Plus with only 1.7v of vcore that limits you even further. Get a cheap Epox 8rda for $85 at newegg, they are a overclockers dream!