@mrworldwide; you have only specified the input units of SMPS. the output values are actually needed. ie the rating in watts of the SMPS. check its manual. Anyway, I'm guessing your PSU's rating is atleast 250W(The PSUs come within the case are of 250W or higher in general). And, to run your card, no separate power connectors are needed. the card will draw power from the PCI slot.