NVIDIA has recently released
a new driver for its graphics cards. However, this driver introduced an issue for owners of factory-overclocked Pascal cards. According to reports, this driver prevented these Pascal cards to push VRAM clocks above 810MHz. NVIDIA was quick to react and released today a hotfix driver that addresses this particular issue. In addition, Arkane Studios recommends this brand new driver for Dishonored 2, so there may be some additional optimizations for this particular title.
I also suggest owners of other NVIDIA cards to skip the NVIDIA GeForce 375.86 WHQL driver and download this brand new hotfix driver.