ASUS GPUTweak will ship with ASUS graphics cards starting later this year but they did indicate that it will be available as free download for users of ANY brand of graphics card; which is a nice way to gain some street cred. The software combines a monitoring application, overclocking application and custom version of GPU-Z in a single interface to allow users to really push their GPUs beyond stock settings.
Besides the semi-standard options of frequency (both GPU and memory), voltages a** speeds, ASUS GPUTweak software will allow users of ASUS Matrix / ROG graphics cards to modify the timings on their GPU memory as well, something that is unique to its offerings.