Radeon 3850 Install question

Hi, I just installed the Radeon 3850 and I had a question. It comes with a cable, one end plugs into the video card, the other end has two inputs that connect to the power supply. The two cables coming out of my power supply had 4 pins on them. The two cables with the Radeon 3850 had 3 pins and 1 empty slot. They fit together, and as it stands right now my computer is running with them connected like that... Is there any harm in doing that? Should there be an adapter I need to purchase Separately or is this normal? Will it hurt my comp or reduce my performance?

Thanks for your time,

-SlayerEssence

PS This is for the "SAPPHIRE 100228L Radeon HD 3850 512MB 256-bit GDDR3 AGP 4X/8X HDCP Ready Video Card" if it makes a difference


Here are some pictures. This is what the cord looks like coming from my video card. Note the 3 prongs (for lack of a better word?) http://sideshowdev.com/images/prod [...] -cable.jpg

This is the thing it is connecting too. It has 4 prong inputs. http://pictures.xbox-scene.com/xbo [...] nector.jpg

Is that normal and ok?