This didn't happen to me, but I was looking through messages in a Discord server and somebody said their friend's brand new GTX 1060, that they bought in person from a store, is performing similarly to a GTX 650. I asked him if maybe it was an older card with a GTX 1060s BIOS to make it appear as one in windows, but no, it's a legit 1060, but it's performing horribly. Any help would be great and I'll dm him with any questions you guys have since I know it'll most likely take a lot more information to figure this out.