Sata adaptor needed for geforce 9800 video card?

Ok so i just bought a new dell 546 inspiron and i was puting in my geforce gt 9800 and it fit fine into the pci exspress slot but then the power cords wernt the same as the one from the computer. So we called the company and they said we needto get a sata power adaptor for it....anyone have a clue whereto find one.