looked online and the older card at max load was 171w. the new card at max load is 247w.
from new egg web page there two 12 volt rails each has max of 14 amps. if you do the math 12 volts times 14 amp you get 168w for each 12v leg. without opening the ps my best gusts would be one leg for the cpu and mb and one leg for the video card. as the older card was only a few watts over the max of one of the legs it was close that the ps could handle the load. on the other hand the other card may have been stressing the cheap power supply past it max voltage till the unit failed. hopfully it was a cap or the fuse failed..on cheap ps they can take out your system when they go sometimes. I would look into buying a good 500-600w ps and hope that the mb and cpu are fine.