AMD ATI Radeon HD 5850 User Manual page 27

Change Motherboard BIOS Settings
Some motherboards may have a system BIOS option to switch between single
and dual PCIe slot support. The default setting may be single slot support. Refer
to the motherboard's manual for information to enable dual PCIe slot support.
For more information see the ATI CrossFireX Web page at
crossfire.
Use Graphics Cards with Different Amounts of Memory
In some ATI CrossFireX configurations, graphics cards with different amounts of
memory can by used; however, restarting your computer is required after
enabling ATI CrossFireX. This will cause ATI CrossFireX to reduce the amount of
memory on the card with the most amount of memory to match the memory size
of the graphics card with the least amount of memory.
Clicking OK to the memory mismatch error message will restart your computer.
Note: When disabling ATI CrossFireX you will be given the option to restart your
computer to restore the original graphics memory size or continue with the
reduced memory size.
Card Reversal Recommended
A recommendation message to reverse the graphics card positions may appear
if the primary graphics card is not installed into the primary PCIe slot. Although
ATI CrossFireX can be enabled, performance may be improved by reversing the
graphics cards in the computer.
See your motherboard's manual to determine which is the primary PCIe slot.
3D Client is Active
You will not be able to start ATI CrossFireX if a 3D application, game, or video
playback, such as a DVD movie, is running.
Close all open 3D applications, games, and movie player applications, and then
enable ATI CrossFireX.
ATI CrossFireX is Currently Unavailable
This error has occurred because ATI CrossFireX did not correctly detect your
graphics hardware or there is a problem with the software.
Check that the graphics cards are installed correctly.
•
Check that the interconnect cable is installed correctly.
•
Close all running 3D applications.
•
Check that the ATI CrossFireX mode is set to Software in the
•
ATI Catalyst Control Center. (The ATI Radeon HD 5850/5870 can only use
ATI CrossFireX technology in software mode.)
Reinstall the ATI Catalyst Control Center and drivers.
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© 2009 Advanced Micro Devices, Inc.
Troubleshooting ATI CrossFireX 21
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ATI Radeon™ HD 5850/5870