NVIDIA has released a brand new driver for its graphics cards. According to the release notes, the NVIDIA GeForce 418.81 WHQL driver is described as a reference driver that can be installed on supported NVIDIA notebook GPUs and adds support for DLSS in 3DMark Port Royal.
Source: N4G PC NVIDIA GeForce 418.81 WHQL driver released, adds support for DLSS in 3DMark Port Royal