What happens when graphics cards with varying memory speeds and engine clocks are paired together?
The overall performance will be adjusted to match the memory speeds and engine clocks of the lower clocked card. To obtain the ideal performance, graphics cards should be paired correctly using the AMD Crossfire compatibility chart.
I Have Multiple AMD Radeon™ Graphics Cards Installed and Have Disabled AMD Crossfire™ Technology on My System. Which Display Modes Can Be Used?
The Clone (presentation), Extended, and AMD Eyefinity technology modes can be enabled on each of the installed graphics card by running AMD Crossfire™ technology on your system. Multiple monitor setups can be configured through the AMD Catalyst™ Control Center or AMD VISION Engine Control Center.
Here is a brief description of each mode and its function:
Clone (Presentation) Mode
- In this mode, the same identical desktop is shown on both displays simultaneously. Both monitors will run at the same resolution and refresh rate.
- Clone mode is useful for presentations where one display is in front of the presenter and the other display is in front of the audience.
Note: Clone mode does not clone displays on different graphics cards. Clone mode only works on displays that are connected to the same graphics cards.
- Each monitor is configured with separate settings (resolution, refresh rates, color quality). The Windows® desktop is extended between the two or more monitors (except for the task bar).
- In extended mode, the displays can be rotated between portrait and landscape view to maximize working desktop space.
AMD Eyefinity Group Mode
- The Windows desktop is stretched between two or more monitors and is treated as one large desktop, complete with a Windows taskbar across all screens. The final resolution is the horizontal and vertical sum of the individual monitors.
- Example: 4 x monitors arranged in a 2 x 2 configuration and each running at 1280 X 1024 = desktop area now running at 2560 X 2048
Note: The AMD Eyefinity group mode is not available under the Microsoft® Windows XP operating system.
For more information on the AMD Eyefinity Group Configuration, please also read our Setting up AMD Eyefinity Technology Display Groups knowledgebase article.
I just bought an AMD Radeon™ HD 6000 Series graphics card. How do I configure my PC to take advantage of AMD Radeon™ Dual Graphics?
To take advantage of AMD Radeon™ Dual Graphics, you must use a compatible AMD A-Series APU to pair with your supported AMD Radeon™ HD 6000 Series card. After installation of your graphics card, install the latest AMD graphics drivers. After driver installation, the option to enable AMD Radeon™ Dual Graphics should become available in the AMD VISION Engine Control Center.
Once installed, go into the "Performance" section of the AMD VISION Engine Control Center and check the box that says 'Enable Crossfire™' - this will allow the AMD A-Series APU graphics to work in tandem with the select AMD Radeon™ HD 6000 Series GPU installed for increased graphics performance.
I Have Multiple AMD Radeon™ Graphics Cards Setup in AMD Crossfire™ technology. Which Output Connectors Can Be Used?
AMD Crossfire™ technology enables the output connectors on the primary graphics card. The primary graphics card is the one located closest to the CPU.
How do I know my AMD Radeon™ HD Graphics card is capable of supporting AMD Radeon™ Dual Graphics?
There are two main
ways to find out if your system can support AMD Radeon™ Dual Graphics. One, you
can go to www.amd.com/dualgraphics
and get the latest information, including all supported discrete GPUs. Two, if
you purchase an AMD A-Series APU for your desktop PC as an individual
processor-in-a-box (PIB), the right hand panel will show the supported discrete
GPUs for that particular APU model.
Where do I plug my monitor in to get the best performance when using AMD Radeon™ Dual Graphics technology?
For best performance,
AMD recommends plugging the display into your discrete graphics card. This will
ensure that even applications that do not take advantage of AMD Radeon™ Dual
Graphics will still be able to run on the faster graphics card in your system.
However, to be more accurate, we recommend that you plug your monitor into the
AMD Radeon™ graphics with the higher model number. If that is your APU, plug
into the motherboard, if it is your discrete graphics card, plug into that.
Why doesn’t my DirectX® 9 game look better on AMD Radeon™ Dual Graphics?
AMD Radeon™ Dual Graphics was designed only for the latest DirectX® levels to allow AMD to focus resources on providing an optimal user experience on the latest graphics technologies. AMD encourages users to take advantage of these and numerous other innovations that have come to market recently by upgrading system hardware.
AMD Radeon™ HD 6000 Series graphics, found in both AMD A-Series APUs and discrete video cards, are designed to deliver the best possible DirectX® 11 experience. As such, the dual graphics performance increase is applicable to select DirectX® 11 & DirectX® 10 enabled applications. For DirectX® 9 applications, the combined performance will be disabled and the fastest graphics engine will perform those tasks; however, users will still experience the speed and performance of AMD Radeon™ graphics.
Why doesn’t AMD Radeon™ Dual Graphics work with Windows XP?
AMD Radeon™ Dual Graphics was designed for the latest Microsoft Windows operating system; this allows AMD to focus resources on providing an optimal user experience on the latest platform technology. AMD encourages users to upgrade to the latest operating system to take full advantage of the features and benefits of Windows 7 (including DirectX® 10 & Direct® 11) to ensure users get the best performance for what they do with their PC. For users that continue to use Windows XP and previous versions, dual graphics combined performance functionality will be disabled and the fastest graphics engine will perform those tasks.
Does AMD Radeon™ Dual Graphics work with AMD Eyefinity Technology?
AMD Radeon™ Dual
Graphics will support AMD Eyefinity Technology as long as your discrete GPU
supports AMD Eyefinity Technology and monitors are plugged into the discrete
With a multi-monitor setup, why do some of the displays become disabled when I enable AMD Radeon™ Dual Graphics?
AMD Radeon™ Dual
Graphics is a form of AMD CrossFireX™ Technology and with the current solution
only displays from the 'master' graphics device (the one that monitors are
plugged into) are available. The other displays are disabled. To ensure your
displays remain available, make sure to connect your displays to the 'master'
graphics device. The 'master' device settings can be found in the AMD VISION
Engine Control Center, which is the user interface for the drivers and
What are the system requirements for AMD CrossFire™?
The minimum requirements to run AMD CrossFire are:
- 2x or more AMD Radeon™ HD2000 series or greater graphics cards that are within the same family model number. E.g. 2 x AMD Radeon HD6770
AMD CrossFire supporting motherboard
- At least one AMD CrossFire interconnect bridge for each additional graphics card
Note - Running more than one graphics card on a system may require a higher rated power supply or a power supply that features enough power connections for each graphics card. Please refer to the list of
AMD CrossFire certified power supplies.
How many AMD Radeon graphics cards can I have in an AMD CrossFire configuration?
AMD Crossfire is limited to a maximum of four GPUs in an AMD CrossFire configuration; either four AMD Radeon graphics cards each with a single GPU or two AMD Radeon graphics cards that feature two GPUs per graphics card, such as the AMD Radeon HD 6990.