nvrtclk.exe is a RealTime Clock Controller
belonging to Gigabyte VGA utility
. This scales the processor down for 2d and up for 3d games.
Non-system processes like nvrtclk.exe originate from software you installed on your system. Since most applications store data in your system's registry, it is likely that your registry has suffered fragmentation and accumulated invalid entries which can affect your PC's performance. It is recommended that you check your registry to identify slowdown issues