Manual
Page 19
... driver in the operating system, go to the manual that came with two PCI Express x16 slots and correct driver - System Requirements - One CrossFire (Note)/SLI bridge connector - C-2. Step 2: Insert the CrossFire (Note)/SLI bridge connector in "1-5 Installing an Expansion Card" and install two CrossFireX/SLI graphics cards on the PCIEX16 slot.
... driver in the operating system, go to the manual that came with two PCI Express x16 slots and correct driver - System Requirements - One CrossFire (Note)/SLI bridge connector - C-2. Step 2: Insert the CrossFire (Note)/SLI bridge connector in "1-5 Installing an Expansion Card" and install two CrossFireX/SLI graphics cards on the PCIEX16 slot.