Welcome to the forums..You mean OC (overclock)..Yes..And it may help to know the exact model of 760 you have.
 
Get EVGA Precision XOC.
Get Unigine Heaven Benchmark.
 
In Precision XOC, increase the GPU Clock Offset, start with a +52 MHz Offset which should be good.
 
Run the Heaven Benchmark and see if your PC freezes, the graphics driver resets or artifacts are observed..Keep increasing the GPU Clock Offset by 13 MHz increments and running the Heaven Benchmark until such problems occur..Then decrease the GPU Clock Offset by 13 MHz until it's okay.
 
When you get the GPU Clock stable, do the same thing with the Mem Clock Offset until it's stable..Starting with a +100 MHz Mem Clock Offset should be okay, you can then decrease by 50 MHz.
 
There's lots of guides online about how to overclock your GPU..Here is an older short guide to PrecisionX..Also some videos here on YouTube..EVGA on the Tube has many informative/instructional videos also.
  
Long story short = Increase the GPU Clock Offset until you have problems, then back it off until it works..Same thing with Mem Clock Offset..You can increase Power Target and/or Temp Target if those are limiting your overclock.
 
You can use "Run" in EVGA OC Scanner (with Artifact scanner enabled) as a more quick test to catch artifacts and other problems.
 
Just because a GPU overclock works in one benchmark doesn't mean it will work in all benchmarks..Just because a GPU overclock works in benchmarks doesn't mean it will work okay in games and vice-versa.
 
The Maximum GPU Temperature for a GTX 760 chip is 97C, but it will throttle at 80C unless overridden/increased in Precision..By NVIDIA design (GPU Boost), you can only effectively increase/decrease the GPU Clock of your card in 13 MHz increments or multiples of 13 MHZ..You can, but really should not let the GPU temperature get over 80C under any circumstances..You should set the GPU Temperature alarm in Precision -> OSD Settings..You can create a custom fan curve to help with cooling.
 
Al this should get you started on the right path.