Overclocking on P5ND

Im coming from a diff asus board that was really nice.. but anyways

Wat is the HT voltage and NB and Sb normally or should be at..

for my oc..

Bc im fine until i start watching something on VLC player and the system locks up

couple screens

Or would i be better off with someone like this

http://www.ecost.com/detail.aspx?edp=41606914&navid=155441524

i can get this at my work to
http://img11.imageshack.us/i/dsc00634j.jpg/

http://img22.imageshack.us/i/dsc00635r.jpg/