New driver version is finally out:
http://www.nvidia.co.uk/download/driverResults.aspx/83148/en-uk
Version: 347.88 WHQL
Release Date: 2015.3.17
Operating System: Windows 7 64-bit, Windows 8.1 64-bit, Windows 8 64-bit
Language: English (UK)
Full release notes:
http://uk.download.nvidia.com/Windows/347.88/347.88-win8-win7-notebook-release-notes.pdf
A quick search did not turn up any feedback about overclocking on GTX 900m series. This will need testing.
http://www.nvidia.co.uk/download/driverResults.aspx/83148/en-uk
Version: 347.88 WHQL
Release Date: 2015.3.17
Operating System: Windows 7 64-bit, Windows 8.1 64-bit, Windows 8 64-bit
Language: English (UK)
Full release notes:
http://uk.download.nvidia.com/Windows/347.88/347.88-win8-win7-notebook-release-notes.pdf
A quick search did not turn up any feedback about overclocking on GTX 900m series. This will need testing.