how much can i safely overclock and/or underclock my gpu?

[hackaholic5069]

i have a previously school-owned Dell Latitude E5400 With stock hardware, no external devices for cooling, no plans to get any. what is a safe overclock and underclock, for if im on a plane or some other lack of power

 

[PuperHacker]

Better not touch that. That device is not made to be tinkered with. Leave it as it is.