NVIDIA Disables GeForce GTX 900M Mobile GPU Overclocking with Driver Update
 

With GeForce R347 drivers (version 347.29), NVIDIA disabled overclocking on its GeForce GTX 900M series mobile GPUs. Buyers of new notebooks, and using older drivers, with the chips fell under the impression that like their desktop counterparts, the GTX 900M series support overclocking, until they updated their drivers to 347.29, to find that their overclocks were wiped back to reference clocks, and overclocking using third-party tools was disabled.

When angry users took to the official GeForce forums to report the bug, NVIDIA explained that overclocking on the GTX 900M series was enabled by accident, and has since been disabled with the recent driver updates. This explanation was met by angry reactions by users who argued that they should be allowed to use the hardware as they want, even if it voids their warranties. Historically, overclocking was allowed on NVIDIA GPUs.

http://www.techpowerup.com/209820/nv...er-update.html