Man, I wouldn't had done that. That's just UGH. I would have #1 returned it, #2 kept it #3 gave it to someone more deserving for the cost of the other pair you bought.
But that's just me.
I once got a CPU, GPU, and some other stuff at a computer store for free on accident. I didn't know wtf was going on, and was too excited to start working on the build. But long story short, the PC is still in the other room for my sister.
Q6600, 4GB of ram, 3850, Corsair TX750,
A TX750 for a 3850? Overkill much?