Every card overclocks differently. What works for someone else may not work for you. You can find your max stable clocks by doing the following...
 
#1 Increase the core clock in +13 MHz increments. Test each +13 MHz increase by running nier automata for 10 minutes on each increase. If you crash/start to see artifacts back off the core clock  -13 until stable. Note max core clock for later. Reset core to default settings.
#2 Increase memory clock in +100 MHz increments. Test each +100 MHz increase by running nier automata for 10 minutes on each increase. If you crash/start to see artifacts back off the memory clock -50 until stable. Leave max memory clock.
#3 Apply max core & memory clock together. Run nier automata for 10 minutes. If no crash/artifacts occur you're good to go. If you crash/artifact back off the memory -50 until stable.
 
 

the game runs to 30 to 49 fps. Im doing overcloking cause the minimum requirements for the game is nvidia gtx 770.

Gomez99
Depending on what you're trying to achieve overclocking may not be the end all be all for you. If you're just trying to squeeze a few more frames out it will work, but if the game is barely playable overclocking will not solve it. You will either have to upgrade your card or downgrade you settings in game

I agree 100% with Gomez. Overclocking typically will only gain you 5-10FPS if you're lucky. But in terms of overclocking, Sajins overclocking advice is as beautiful as it gets & it won't hurt to try. The GTX 760(and similar performing cards) has really started showing end of life with new games coming out for 1080p gaming, you might see if you can pick up something like a GTX 970 used, then sell the 760 to recover some of the costs.