NVIDIA published GeForce 344.65 WHQL, the new recommended driver release for Assassin's Creed: Unity. The 344.65 driver can be downloaded over here.
New in GeForce Game Ready Drivers
The new GeForce Game Ready driver, release 344.65 WHQL, includes improvements which allows GeForce owners to continue to have the ultimate gaming platform. In addition, this Game Ready WHQL driver ensures you'll have the best possible gaming experience for Assassin’s Creed: Unity
Best gaming experience for Assassin’s Creed: Unity
Windows Vista/Windows 7/Windows 8/Windows 8.1 Fixed Issues:
340.52, GeForce GTX 750 Ti: Characters faces are blacked out in Risen 2: Dark Waters.
340.52: Space Engine does not allow HDR or FXAA to be set in game settings after an
update to R340 drivers. 
332.21, Windows 8.1: Tomb Raider has a significant drop off in performance with 3D
Vision enabled in SLI. 
GeForce GTX 980 SLI, Windows 8.1. Ryse: Son of Rome exhibits stuttering during
Need an SLI profile for Train Simulator 2015.