How high could I overclock my GeForce GTX 770?

[colewalsh]

I have a default 770 from nvidia. I have been able to play BF4 on max with 70 fps and others like COD Ghosts with about 90 but im looking for stupidly good performance. I have a MSI Z87 G45 gaming motherboard and I have already installed MSI AfterBurner. Please help!

 

[AlexBournemouth2013]

My Lightning overclocks really well. I have found the only game that artifacts (after several hours of play) is Metro: Last Light. I have found that adding 72MHz onto the core (1222 clock/1326 boost) and 545Mhz onto the memory (8100) has the best stability. 1222 and 1326 is divisible by 13Mhz--which is the clock steps nVidia use on Kepler cards, when the card boosts.