Heres a quick run down of a system I have acquired as a DOA and managed to resurrect it :)

 Gigavyte GA-7zx Motherboard (Rev 1.01)

Amd Athlon XP 1700 processor

Nvidia FX5200 GFX card

Creative SB128 PCI sound card

3com 10/100 NIC

1 x 4 port usb2 PCI expansion card

1 additional ATA-133 IDE controller expansion card

4 HDDs, 1 Floppy, DVD and CD/RW drives, 512mb Ram, 450Watt PSU

...Spotted it yet?

...  Yes, the Gigabyte motherboard and Athlon XP 1700 chip combo.  My system is running an 133mhz FSB and the BIOS reports the processor to be running at 1100mhz, 600mhz shy of the Rated speed for this chip (and about 357mhz short of the actual speed according to AMDs site).  so its underclocked! 

Is this a first?  Ive never heard of someone Underclocking a chip before!   I have no idea who built it before me, but I have to say, this thing is SOLID.  I cant crash it!  It runs DX9 intensive 3d games (Eve Online is probably a good example) with no problems.

Your rig is underclocked because it is only running a 100MHz FSB (11 X 100 = 1100MHz). Change the FSB to 133MHz and it will run at the rated 1463MHz (11 X 133 = 1463MHz). Underclocking is not new. Some do it to lower the temperatures of their rig, while others do it to achieve a more stable system.

 somtimes on a laptop  you can get more out of your battery this way