Now I may get flamed for this, but I am going to start discourage members from over volting too high.
I don't have solid proof, but just from personal experience and empirical evidence, I have witnessed a much higher failure rate from those who over volt their cards.
I have seen users here RMA their 4XX cards and 5XXX cards already! And most of them havent had the card for longer than a couple of months.
Ever since I started to heavily over volt my GPUs, I have RMA'd four, yes FOUR times in total (prior to this, I have never had to RMA a card).
It could be bad luck, terrible quality control, or what have you, but I cannot deny the fact ever since I have seen people over volt via software like Afterburner, there has been a substantial increase in number of defects and RMA.
I dont know if anyone else has noticed this, but this is something I have taken note of recently.