Question Does this PSU have enough power for this build ?

Generally the cx430 is a quite terrible unit and I would not recommend that for your system.

Has that system already been running with that PSU for awhile? If so you could make the argument for leaving it with that PSU since there's not much to lose if it goes boom. But probably not a good mindset
 
The S suffix processors are low power variants.
The 450ww psu is enough to run with a 970.
But, as others have said, the psu is old and not the greatest quality.

If you have one, try it.
If you don't, look for something stronger and of better quality.