Yeah, I'd say it's pretty good! I have it installed on top of my 6700K @ 4.7 and couldn't be happier with the temps ( well, truthfully I'd be happier with an NH-D14/15 or Cryorig R1). Highest temperatures I've seen while playing Witcher 3 were:
core 0: 59
core 1: 62
core 2: 58
core 3: 58...