Gigabyte GV-R455D3-512I Manual - Page 9

How to enable the ATI CrossFireXTM technology? Step 1: Install two CrossFireX graphics cards of the same chipset on a CrossFireX-supported motherboard (Figure 1). Then users can enable the CrossFireX technology through the graphics card driver. Two CrossFire graphics cards of the same type. (Example: GV-RX16P128P-RH) Figure 1 Step 2: After installing graphics card driver in operating system, when an ATI CrossFireX configuration is detected for the first time by the ATI Catalyst display driver, ATI CrossFireX support is automatically enabled, and the best possible GPU combination is selected based on the hardware configuration. If ATI CrossFireX is not enabled, access the ATI Catalyst Control Center (please refer to Page 14). From the ATI Catalyst Control Center, enter the CrossFireX menu and assure to select the Enable CrossFireTM check box (Figure 2). Figure 2 - 9 - Hardware Installation