Gigabyte GA-X99-UD4 User Manual page 20

C. Configuring the Graphics Card Driver
C-1. To Enable CrossFire Function
After installing the graphics card driver in the operating system, go
to the AMD Catalyst Control Center. Browse to Performance\
AMD CrossFireX and ensure the Enable AMD CrossFireX
™
check box is selected. If your system has more than two CrossFire
cards, select the GPU combination you want to use and click Apply.
(Available combination options are dependent on the number of
graphics cards.)
C-2. To Enable SLI Function
After installing the graphics card driver in the operating system, go to
the NVIDIA Control Panel. Browse to the Configure SLI, Surround,
Physx screen and ensure Maximize 3D performance is enabled.
Hardware Installation - 20 -