We know that installing beta software can be scary. You never know what kinds of bugs might pop up or if stability will be an issue. At the same time, if you're wielding dual AMD graphics cards in a CrossFire configuration and play Battlefield 4, it's probably worth taking the risk on AMD's Catalyst 13.11 beta driver for Windows. This is the 7th beta release for this driver family, so any early bugs should have already been rooted out.
The sole benefit of installing Catalyst 13.11 beta 7 versus beta 6 is that it increases CrossFire scaling up to an additional 20 percent for BF4. That's a significant bump, and it's yours for the taking if you don't mind chancing beta software.
This latest release also incorporates all the performance boosts from previous beta releases, including:
Batman: Arkham Origins - improves performance up to 35 percent with MSAA 8x enabled
Total War: Rome 2 - improves performance up to 10 percent
Battlefield 3 - improves performance up to 10 percent
GRID 2 - improves performance up to 8.5 percent
DiRT Showdown - improves performance up to 10 percent
Formula 1 2013 - improves performance up to 8 percent
DiRT 3 - improves performance up to 7 percent
Sleeping Dogs - improves performance up to 5 percent
In addition, these beta releases add support for AMD's recently announced Radeon R9 290 and 290X graphics cards, add automatic AMD Eyefinity configuration, and automatic plug-and-play configuration of supported Ultra HD/4K tiled displays.
More info can be found in the Release Notes, along with links to download the driver to both desktop and mobile systems.