I have an Iwill266Plus motherboard with an AMD 1900+ cpu. When I had Win98SE on it the PC would boot and everything showing 1900+ as the speed on the boot up screen. Anyway, I wanted to put WinXP on so I updated the BIOS and installed XP. At this time I also added a new hard drive and a firewire card. It was an hour or so after doing all of this that I noticed the speed now showed to be 1500+. It seems like I can change the settings in the cmos but this seems like I would essentially be overclocking which I really don't want to do. Any suggestions? Any advice is greatly appreciated!