The FSB should be running at 400 by default because of the CPU and RAM combination. The BIOS requires no special settings or changes in the default settings to attain the 400 FSB. Did I miss something?

The hard drives are ATA-133 which are also necessary to attain the throughput you desire, so I suspect the slow performance is not CPU, RAM, Hard drive specifications related. Are the hard drives on the same IDE channel or seperate channels? The two hard drives should be on the same IDE channel in this system configuration. Are the hard drives defraged? Other drives, CD-ROM, CD-Recorder, should be primary slaves.

This is a single XP system? Are you dual booting multiple operating sytems? Is the page swap file on the boot drive or the secondary master? Move it to the secondary master in this configuration. Did you perform a clean installation of XP, an upgrade, an unattended install, etc.? Install XP clean, i.e. format the hard drive and iinstall. Do not overwrite the present installation.

Run the bench marks software with only XP installed for a true diagnostic. Last, turn off any unnecessay background services. See http://www.blackviper.com for details and tweaks to XP.