The name of the motherboard. The speed of the ram and the exact spec of the cpu ( 1.8 Ghz?) would help.
It is likely to be the speed of the fsb. It could be running at 100Mhz and not 200Mhz. 0.9Ghz against 1.8Ghz. It could also be that resetting the bios may have enable cool and queit ( if your board supports it). It could also be memory speed dragging down the system if it is not set correctley.