What do you guys think? I'm not really too trusting of used parts, I wanted to get a second opinion.
If you can test it and it works fine, without any weird noises and (or) high temperatures, it should do the job just fine.
And if it has a valid warranty, that would be even better.
The only problem would be, if that particular GPU (that has an BIOS switch) has been altered with an special BIOS update for mining purposes for example, thus you can't be sure how well that GPU does perform or will perform after an extended time interval of usage.
So, just watch it!
You're welcome :)