Nvidia plugin for Conky

In the terminal run conky -v If you don't see nvidia in the compiled in features, install the conky-all package which is compiled with all options including nvidia.

${color CC9900}GPU:$color $alignr ${execi 60 nvidia-settings -query GPUCoreTemp | perl -ne 'print $1 if /GPUCoreTemp.*?: (\d+)./;'} C
${color CC9900}VIDEO ${hr 2}$color
NVidia GeForce GPU $alignr ${nvidia gpufreq} Mhz
Memory $alignr ${nvidia memfreq} Mhz
Temperature $alignr ${nvidia temp} C

if you don't want to use the nvidia-settings application, conky can read the values itself. You just have to recompile conky with the --enable-nvidia option. Then ${nvidia temp}°C will work. It's not compiled by default because of known reasons.