Is it new or used by someone you know? are you playing games @ 1080P?
PNY is a decent company. Im not sure I would by one if it were refurbished.
my 670 for 1080P is really enjoyable. Frame rates are high on the highest settings in most games.
I haven't played any games like the witcher 2/3 or skyrim with mods, but crysis 3 battlefield, most other games it's a great card capable of full settings in most scenarios.
Depending on what you are upgrading from it may be something special. 570-----> 670 for me was almost night and day.