GPU OC values?

[Tenge500]

Is adjusting (in this case increasing) the max voltage safe? When should it be increased?

Is memory clock worth increasing?

[TheMcSame]

 I'm pretty sure graphics cards have a voltage lock to prevent you from destroying it.

 

As for memory, yes it's worth it. 

[ryan9298b2]

Graphics cards do have a voltage lock, yes, however, even .150v for a GPU is a BIG voltage change.  Not necessarily harmful in all cases, but will require additional cooling.  Increasing the voltage is to a certain extent (IMO, .1v or less) is "safe" but as always, any overclocking is not a guarantee and should be taken with a grain of salt.  Higher voltage allows the GPU clock speed to be increased further than on stock voltage.  Increasing clock speed has a negligible effect on temperature.  Increasing voltage is what generates more heat.  Memory overclocking is very finicky, sometimes you get a card that can add 100s of MHz to the memory, and sometimes (like I did) adding 2MHz, yes 2MHz, causes the card to glitch out and crash.