Extra Hit Points

This advantage in Classic functions differently than buying up Hit Points in 4e. As GURPS Blood Types 59 highlights::
:Any roll vs. HT, Contests of HT, resistances, calculation of survival and unconsciousness rolls and anything else involving HT would be made against the HT of 14.
:Only damage is subtracted from 20.
:Example: If a vampire has HT 14/20, he would experience -HT penalties at -14, not -20.
Ignoring the obvious shifting from HP to being ST-based instead of HT-based, the clear difference here is that buying up HP did not give you extra survival multiples in the negative. The positive-only benefits are similar to Vitality Reserves except you still suffer shock.
==see also==
*Extra Stun Points
Category:Depreciated Advantages