HP Vectra VEi8 Supplementary Manual page 22

NOTE
Replacing the Pentium Processor (VEi8 models)
4 If a jumper is provided with the new processor, insert the new
jumper into the jumper block situated in front of the processor
heatsink.
5 Replace the cover (described in this chapter).
If you change your processor or system board, you may need to update
your BIOS. The latest BIOS for your PC and instructions on updating the
BIOS are available from:
Processor frequency
jumper (provided with
certain processors only)
www.hp.com/go/vectrasupport
.