ASROCK P55 Extreme4 Handbuch Seite 22

For Windows
Install the CATALYST Control Center. Please check AMD website for details.
Step 4. Restart your computer.
Step 5. Install the VGA card drivers to your system, and restart your computer.
Then you will find "ATI Catalyst Control Center" on your Windows
ATI Catalyst Control Center
Step 6. Double-click "ATI Catalyst Control Center". Click "View", select
"CrossFireX
option according to the total GPU number on the Radeon graphics cards.
Click "Apply".
Although you have selected the option "Enable CrossFire
function may not work actually. Your computer will automatically reboot. After
restarting your computer, please confirm whether the option "Enable CrossFire
in "ATI Catalyst Control Center" is selected or not; if not, please select it again,
and then you are able to enjoy the benefit of CrossFireX
Step 7. You can freely enjoy the benefit of CrossFireX
feature.
* CrossFireX TM appearing here is a registered trademark of ATI
used only for identification or explanation and to the owners' benefit, without intent to infringe.
* For further information of ATI
updates and details.
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® TM
7 / Vista OS:
TM ", and then check the item "Enable CrossFireX
TM CrossFireX TM technology, please check AMD website for
ASRock P55 Extreme4 Motherboard
® taskbar.
TM ". Select the
TM ", the CrossFireX
TM
TM feature.
TM or Quad CrossFireX
TM Technologies Inc., and is
TM
"
TM