You have a dell bios right? cause if you do your fucked, cant overclock, cant see your temps, cant do shit.
Trust me man i hate it too, i'm using a Dell E5150 and i've been looking everywhere to try an O/C it.
If you wanna overclock your graphics card, your in luck:
Try going 30mhz higher on your Gpu and 30mhz higher on your Memory Frequency. test it on a game and if you see any stuttering or weird coloring go lower if you dont go 10mhz higher. basically try and see what speed will work for you.
I got over 60mhz higher on my gpu and memory with my nvidia, 10 fps faster