NVIDIA has released beta drivers which have been coded with Battlefield 3 in mind. The drivers are named as GeForce R285.38 and are available immediately from NVIDIA's site. Supported products range from as old as the GeForce 6 series to the latest GeForce 500 series. 

The release comes at a good time since the open beta of Battlefield 3 will be available on Thursday 29th (27th if you pre-ordered through Origin). NVIDIA claims up to a 38% performance increase in Battlefield 3, as well as overall stability improvements. The beta drivers add better support for SLI configurations in a few other games too, such as Diablo III and Saints Row: The Third. 

Source: NVIDIA