TechPowerUp reports NVIDIA's new laptop driver releases have once again disabled overclocking on mobile GPUs. Earlier this year the company was in the new for the exact same reason, in February its GeForce 347.29 WHQL driver disabled GPU overclocking on laptops, with NVIDIA claiming a "bug" allowed overclocking on previous drivers.
Due to pressure from computer enthusiasts, NVIDIA re-enabled overclocking in the GeForce 347.88 but it seems the latest R350 and R352 drivers no longer allow it.
Hoping that nobody would notice, the company seems to have reinstated the overclocking block, or "clock-block" as the community is calling it; with its R350 and R352 drivers, such as the GeForce 352.86. Enthusiasts in notebook-centric communities such as NotebookReview, discovered that the latest GeForce drivers prevent overclocking if it reads a "lock-bit" in the video BIOS.
In what sounds like a repeat of what happened last time, NVIDIA promises to re-enable overclocking in a future driver release.