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ChasnotRobert
Yes that'll do it. I know it seems very obvious but just check the PSU in your PC has a lead with two 4-pin heads spare to run this from.
Edit:
It's also worth checking the power demands as at full draw the card may want more than the molex is rated to supply. I don't know exactly what molex is rated to but IIRC PCIE 6-pin is about 75w, and that card at max is 150W, so as long as it is safe for the other 75W it's all good.