AMD 4800 User Guide - Page 22
Troubleshooting ATI CrossFireX
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16 Reference The computer does not boot up properly. Verify that the installation instructions were followed correctly. Make certain that the graphics card is properly connected to the power supply and the motherboard. If using Windows operating system, restart your computer in Safe Mode. For information on Safe Mode, consult the Windows documentation. Check the system configuration utility for interrupt assignments. The computer boots up but there is no display. Verify that the monitor is connected properly to the computer and a power supply. If your motherboard has on-board graphics capabilities, you may need to disable them. Consult your motherboard documentation for more information. Note: Some manufacturers do not allow the on-board graphics to be disabled or to become the secondary display. During software installation on a PC with the Windows Vista OS, the screen goes blank The software is still installing. Wait 20-30 minutes to make sure the software has finished installing and then restart the computer. Troubleshooting ATI CrossFireX The following are suggested solutions for common ATI CrossFireX troubleshooting issues. 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 ati.amd.com/ 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. ATI Radeon HD 4800 Series © 2008 Advanced Micro Devices, Inc.