And that's the issue. The games wanted are more than that pc can reasonably handle. The rx560 isn't bad, it's just not very strong. To play Witcher3 you'd be far better off with a Rx580.
That's a quad core x3550 Lga1366 Xeon. It can't handle Witcher3 anymore than the rx560 can.
X58 Lga1366 mobo is decent, for what it was 10 years ago, at least it's ddr3 and not ddr2. But still very dated.
It's an obsolete for gaming 10 year old pc.
You'd get far better playability from an Xbox One or Playstation 4. Yes, it's that old and comparably weak. I'd not be surprised if the psu was close to 10 years old as well, and well overdue for replacement as those old units at best were only warranted for 3 years.
No, it's not wort the 50.00 for anything related to gaming.