Hi!
My bad. I was referring to the whole tower. Without the monitor and other stuff.
As I have mentioned before am not tech savvy.
I think the psu of the tower is the one that came with it when the original owner bought it brand new.
As of now its not gonna be a problem i think, since that I would probably go for my initial plan to buy the tower and upgrade 1 gpu.
I am still trying to figure out what gpu to add in the tower, budget and compatibility wise.
How big of a power supply is in it. You probably wont be able to run any more than one gtx1060 single fan or maybe a 1070 if you don't have a psu larger than 400w.
And if you're looking to make this profitable, it probably wont be. If you're looking to build a mining "rig" build a multi-gpu open air rig. These days, even a 6+ GPU 1080ti rig it's hard to net more than 15-20$ a day unless you're really proactive on finding new launch or low difficulty coins.