the info you provided is INITIALLY irrelevant...
we will assume you have space inside your case to house the drive?
assuming your mobo has additional connectors as well?
so, now...assuming the basics that you can add and connect an additional drive...you may want to reconsider swapping the drives. Since the one you are adding is indeed faster.
sata usually does not chain off the existing drive but plugs into the mobo.
some more assumptions I will make and you can answer or not, doesn't matter but for you to check yourself...
does your mobo support sata 3? If not you can still use the new drive but not reap the higher rate, which may not matter to you anyways.
does your mobo have an additional sata connector?
does your psu have additonal sata power connectors? <-- I checked this for you and looks like this drive, from the pictures I looked at, has both the newer sata power as well as older molex power, so you should be ok...depending on what splitters you have and what your psu has free.
you should be good to go though
edit: and you may or may not need a sata cable, oem usually does not come with anything except screws...and sometimes not even