Nvidia has released a new set of beta drivers for its graphics cards. This release, numbered 326.19, includes some performance optimizations and adds SLI profiles for a couple of unreleased games. According to Nvidia, the 326.19 betas improve performance by as much as 19% across all GeForces from the 400 series on up. As an example, the company says the GeForce GTX 770 can see an improvement of up to 15% in Dirt: Showdown and 6% in Tomb Raider. Run a couple of GTX 770s together in SLI mode, and performance can go up even further-as much as 19% in Dirt: Showdown and 11% in F1 2012. In addition, Nvidia says it's added SLI profiles for Splinter Cell: Blacklist, Batman: Arkham Origins and also improve SLI performance in Arma 3.