Nvidia GeForce GT630 on a 255W Psu

[EGAYSC70]

I have a Dell Optiplex 980 DT with a 255w / 12v=18a psu and i want to ask if my Nvidia GT630 can run on this?

 

[Lutfij]

How old is the PSU, is it as old as the system? In short, the unit isn't meant to power the entire system with an additional GPU. If you must know, the DT version of the OptiPlex 980 came with an HD4550 as the highest GPU option so the GT630 would demand more from the PSU.

 

[EGAYSC70]

How old is the PSU, is it as old as the system? In short, the unit isn't meant to power the entire system with an additional GPU. If you must know, the DT version of the OptiPlex 980 came with an HD4550 as the highest GPU option so the GT630 would demand more from the PSU.

I'm not so sure how old this unit is (maybe from year 2010) but i'm pretty sure the psu is the original that came with it.
Right now it's running on a nvidia 7200GS. Works fine but with very limited capabilities (no 3d in photoshop cc). I'm very skeptical about this and is itching to plug it in as I've read that technically it will work. I have a very minimal system with only one harddrive, an intel i5 cpu and everything else is built-in.
I also learned that it's hard to upgrade the PSU on this Dell unit.