The supply has adequate wattage as long as it has adequate amperage on the 12v rails and good regulation you should be back in business. If you still see the card and pump pull the supply down too much then you have to consider a heavier 600-700w supply to meet the higher demand for power. If it comes to that look over the sticky on supplies for choosing a heftier model. Let's see how this goes in the meantime.
http://www.computerforum.com/90118-u...su-guides.html