i was searching online tips to speed up the time of rendering, and i've found one screenshot which is like this 
but in my case there is no option of GPU in the compute device section, have a look at my screenshot

am i missing any hardware ?
i was searching online tips to speed up the time of rendering, and i've found one screenshot which is like this 
but in my case there is no option of GPU in the compute device section, have a look at my screenshot

am i missing any hardware ?