GT 730 GDDR5 Overclock

GT 730s are not meant for overclocking, because of their weak cooling solutions. If you really want to overclock it ,then you can go with 50 MHz bumps and then make stability tests of 1 hour for every bump.
Also can I ask what version of GT 730 do you have ?
 
You can try as I said but you must run Furmark after every bump for 1 hour, also download HWiNFO and watch your temps during the stability test .If you're starting to reach 80+ degrees on your GPU you should stop overclocking ,anything below 80 degrees sbould be fine.