NVIDIA uploaded the GeForce 355.98 WHQL driver, you grab it over here. This release adds support for the new laptop version of the GeForce GTX 980 and features optimizations for Killing Floor 2.
This new GeForce Game Ready driver ensures you'll have the best possible gaming experience in Killing Floor 2. This driver is also aligned with the new flagship gaming GPU for notebooks, the GeForce GTX 980. In addition, this Game Ready driver also includes updated features and functionality for the GameWorks VR software development kit (SDK).
Best gaming experience for Killing Floor 2
New GeForce GPU
Supports the new GeForce GTX 980 for notebooks, based upon the second-generation Maxwell architecture
GameWorks VR Support
Updated driver support for GameWorks VR SDK, adding notebook support, VR SLI enhancements, and bug fixes. Learn more at developer.nvidia.com/vr.