You haven't mentioned what power supply you have so how are we meant to know? Are you keeping the other drive as well? If you are replacing the existing drive theres no problem, if you're installing the drive and leaving the other drive there then its impossible to tell. It will depend on the size of your power supply and whether its a good quality branded one or a cheap generic one.
Chances are it will be fine but why not order the two items at the same time and save on postage.