With the next driver update
Nvidia has finally buckled under community pressure over the recent driver update that disabled overclocking on its mobile GTX 900M series GPUs. The company has announced that it will bring overclocking features back with the next driver update.
Not designed to support overclocking
It appears that Nvidia has permanently disabled overclocking on its mobile Geforce GTX 900M series GPUs with the latest Geforce R347 drivers.