Radeon HD 5850 power question

Hello All,

I have just bought a HD 5850 to speed things up a bit, I am also completely new to this GPU business.

The card has two 6 pin power sockets on its back however I only received one cable that has one 6 pin plug attached to two molex female connectors.

Would that be enough to get the card running or there has to be two of those?

Thanks in advance,