With the imminent release of Battlefield 4 and Arkham Origins, Nvidia recommend all their users to upgrade quick smart to their latest R331 drivers. These drivers increase performance for 400/500/600/700 series cards in several PC games when compared to the 327.23 drivers. Also included is HBAO+ for DirectX9 and DirectX 11 applications and a fair amount of updated SLI profiles.
For those who don't know (or can't remember) HBAO+ is then read this quote from Nvidia.
HBAO+ is a new, NVIDIA-developed Ambient Occlusion technique that utilizes the latest technologies to significantly increase the precision, fidelity, and rendering speed of high-quality AO. It will be seen next in Batman: Arkham Origins, this Friday, where it adds considerable detail to the world’s shading. For further details on HBAO+, please visit our HBAO+ technology page, and for more info on Ambient Occlusion itself, please head here.
Included in this list are increases to DiRT Showdown, Metro: Last Light, Sleeping Dogs and Sniper Elite V2. So basically what Nvidia are saying is upgrade to these now! You can download the drivers from here and while you wait, watch the newly released, official gameplay trailer for Arkham Origins.