when it comes to GPU overclock it really depends. What kind of card is it? what is the factory overclock. In your case, the +115, from what value? reference clock, FE clock, factory OC clock? Its also a big difference it you want to overclock without touching the fan curves (not changing the noise) or if you overclock cranking up the fans to have a 747 in your case. With fans fully blowing I can reach around 2060mhz in games with my card. If I keep in silent without touching the fan curves I reach around 1965Mhz in games.