hallsimon :
apperantly the cards minimum watt is 500, is that right ? seems kinda high
Nvidia and AMD generally overstate the required power, because the have to try and account for the person with the overclocked top end processor and 4 HDDs, or other sorts of semi-overkill setups.
That video card is I think rated at 185W TDP, so your power supply should be more than adequate.