Really? This is more than enough for that system, is a much better quality unit and is new, not used, for four bucks more.
PCPartPicker Part List
Power Supply: Antec High Current Gamer Gold 650 W 80+ Gold Certified Fully Modular ATX Power Supply ($84.99 @ Newegg)
Total: $84.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2019-12-04 22:08 EST-0500
But it's irrelevant because again, you are not absorbing what you are reading. He is not looking to buy this unit for 80 bucks. He said he BOUGHT it, at some point in the past, and it has been sitting unused since buying it. So obviously, like I ALREADY said, yes, it's worth using until such time as he can buy a better one. The problems that unit has are not problems I would want to overlook long term.
The mere fact, among other glaring issues, that it has high ripple would be enough for me to NOT use it with ANY of MY hardware, at ALL. Ripple kills motherboards and graphics cards, because it overheats the capacitors. Some ripple is normal. excessive ripple is deadly to hardware. That unit has excessive ripple.
I WOULD NOT USE IT LONG TERM, AT ALL. PERIOD.
Maybe a month or two at MOST. Ripple is a cumulative killer. It won't take your hardware out immediately, normally, but it will definitely cause damage over a period of weeks of frequent usage, especially if you are using it at high sustained levels. Most units, when they get warm, then voltage fluctuation and ripple levels get worse.
It also has other VERY serious issues, as explained here:
So, it's easy for you to say it will be ok, and it could, but it's not "fine" and it's not even "good" or "ok" really. It is passable, just, for now, but I would not recommend using it long term. There are, as I said, too many issues.