Overclocking Question

[overclockerking]

If I bump up speed do I need more power? If so how much.
Here are my system specs
Ecs E7S5a
Duron 1.0 @1.2 but have gone to 1.4
512 ddr pc2100
40gbWD
Ati Radeon pro
cd-rw
dvd player

Anybody have any tips or comments all are welcome.
Thnx!