Download AMD Catalyst 14.9 WHQL (14.301.1001.0 September 15) driver. This driver is WHQL signed and works with Windows 7 and 8.1.

We have a discussion thread open on this driver right here.

Highlights of AMD Catalyst™ 14.9 Windows Driver

• Support for the AMD Radeon R9 28
• Performance improvements (comparing AMD Catalyst 14.9 vs. AMD Catalyst 14.4)
• 3DMark Sky Diver improvements
• AMD A4 6300 – improves up to 4%
• Enables AMD Dual Graphics / AMD CrossFire support
• 3DMark Fire Strike
• AMD Radeon R9 290 Series - improves up to 5% in Performance Preset
• 3DMark11
• AMD Radeon R9 290 Series / R9 270 Series - improves up to 4% in Entry and Performance Preset
• BioShock Infinite
• AMD Radeon R9 290 Series – 1920x1080 - improves up to 5%
• Company of Heroes 2
• AMD Radeon R9 290 Series - improves up to 8%
• Crysis 3
• AMD Radeon R9 290 Series / R9 270 Series – improves up to 10%
• Grid Auto Sport
• AMD CrossFire profile
• Murdered Soul Suspect
• AMD Radeon R9 290X (2560x1440, 4x MSAA, 16x AF) – improves up to 50%
• AMD Radeon R9 290 Series / R9 270 Series – improves up to 6%
• CrossFire configurations improve scaling up to 75%
• Plants vs. Zombies (Direct3D performance improvements)
• AMD Radeon R9 290X - 1920x1080 Ultra – improves up to 11%
• AMD Radeon R9290X - 2560x1600 Ultra – improves up to  15%
• AMD Radeon R9290X CrossFire configuration (3840x2160 Ultra)  - 92% scaling
• Batman Arkham Origins:
• AMD Radeon R9 290X (4x MSAA) – improves up to 20%
• CrossFire configurations see up to a 70% gain in scaling
• Wildstar
• Power Xpress profile
• Performance improvements to improve smoothness of application
• Performance improves up to 30% on the AMD Radeon R9 and R7 Series of products for both single GPU and Multi-GPU configurations
• Tomb Raider
• AMD Radeon R9 290 Series – improves up to 5%
• Watch Dogs
• AMD Radeon R9 290 Series / R9 270 Series – improves up to 9%
• AMD CrossFire – Frame pacing improvement
• Improved CrossFire performance – up to 20%
• Assassin's Creed IV
• Improves CrossFire scaling (3840x2160 High Settings) up to 93%  (CrossFire scaling improvement of 25% compared to AMD Catalyst 14.4)
• Lichdom
• Improves performance for single GPU and Multi-GPU configurations
• Star Craft II
• AMD Radeon R9 290X (2560x1440, AA, 16x AF) – improves up to 20%
• AMD Eyefinity enhancements
• Mixed Resolution Support
• A new architecture providing brand new capabilities
• Display groups can be created with monitors of different resolution  (including difference sizes and shapes)
• Users have a choice of how surface is created over the display group
1. Fill – legacy mode, best for identical monitors
2. Fit – create the Eyefinity surface using best available rectangular area with attached displays
3. Expand – create a virtual Eyefinity surface using desktops as viewports onto the surface
• Eyefinity Display Alignment
• Enables control over alignment between adjacent monitors
• One-Click Setup
• Driver detects layout of extended desktop
• Can create Eyefinity display group using this layout in one click!

• New user controls for video color and display settings
• Greater control over Video Color Management:
• Controls have been expanded from a single slider for controlling Boost and Hue to per color axis
• Color depth control for Digital Flat Panels (available on supported HDMI and DP displays)
• Allows users to select different color depths per resolution and display
• AMD Mantle enhancements
• Mantle now supports AMD Mobile products with Enduro technology
• Battlefield 4:  AMD Radeon HD 8970M (1366x768; high settings) – 21% gain
• Thief: AMD Radeon HD 8970M (1920x1080; high settings) – 14% gain
• Star Swarm:  AMD Radeon HD 8970M (1920x1080; medium settings) – 274% gain
• Enables support for Multi-GPU configurations with Thief (requires the latest Thief update)
• AMD AM1 JPEG decoding acceleration
• JPEG decoding acceleration was first enabled on the A10 APU Series in AMD Catalyst 14.1 beta, and has now been extended to the AMD AM1 Platform
• Provides fast JPEG decompression
• Provides Power Efficiency for JPEG decompression

Resolved Issues

• 60Hz SST flickering has been identified as an issue with non-standard display timings exhibited by the AOC  U2868PQU panel on certain AMD Radeon™ graphics cards. A software workaround has been implemented in the AMD Catalyst 14.9 driver to resolve the display timing issues with this display
• Users seeing flickering issues in 60Hz SST mode are further encouraged to obtain newer display firmware from their monitor vendor that will resolve flickering at its origin. 
• Users are additionally advised to utilize DisplayPort-certified cables to ensure the integrity of the DisplayPort data connection.
• 4K panel flickering issues found on the AMD Radeon R9 290 Series and AMD Radeon HD 7800 Series
• Screen tearing observed on AMD CrossFire systems with Eyefinity portrait display configurations
• Instability issues for Grid Autosport when running in 2x1 or 1x2 Eyefinity configurations
• Geometry corruption in State of Decay

Known Issues

• [404829]: Horizontal flashing lines on second screen in a clone mode with V-Sync on using AMD Mobility Graphics with Switchable Intel Graphics
• [404508]: Display takes a long time to redraw the screen after an S4 cycle
• [405432]: Mantle driver will TDR when running Star Swarm on the loading screen
• [404660]: GPU gets stuck in a low power state after it was previously stressed to max power
• [403032]: Severe flickering observed on default launch of SimCity 4
• [403449]: Playing any media sample in full screen in the 2x1/1x2 Fill SLS configuration leads to TDR
• [400573]: Intermittent application hang observed while launching Aliens vs. Predator
• [400693]: While running performance test, crash is observed with fault module atidxx32.dll
• [401386]: Severe corruption and flashing light observed with specific game settings in Grid 2
• [401289]: Flashing lights in Batman Arkham Origins game main menu