Gigabyte GA-P55A-UD7 Manual - Page 20
Setup of ATI CrossFireX - power supply
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1-7 Setup of ATI CrossFireX™/NVIDIA SLI Configuration A. System Requirements - The 2-Way SLI and 2-Way CrossFireX technologies currently support Windows 7, Vista, XP operating systems - The 3-Way SLI and 3-Way CrossFireX technologies currently support Windows 7 and Vista operating systems - A CrossFireX/SLI-supported motherboard with two/three PCI Express x16 slots and correct driver - Two/three CrossFireX/SLI-ready graphics cards of identical brand and chip and correct driver (Current NVIDIA GPUs that support 3-Way SLI technology include the 8800 GTX, 8800 Ultra, 9800 GTX, GTX 260 and GTX 280. Current ATI GPUs that support 3-Way CrossFireX technology include the Radeon HD 3800, 4800, and 5800 series) - One/two CrossFire (Note)/SLI bridge connectors - A power supply with sufficient power is recommended (Refer to the manual of your graphics cards for the power requirement) B. Connecting the Graphics Cards Step 1: Observe the steps in "1-6 Installing an Expansion Card" and install two/three CrossFireX/SLI graphics cards on the PCI Express x16 slots. (To set up a 2-Way configuration, we recommend installing the graphics cards on the PCIEX16_1 and PCIEX16_2 slots. ) Step 2: Insert the CrossFire (Note )/SLI bridge connectors in the CrossFireX/SLI gold edge connectors on top of the two/three cards. Step 3: Plug the display cable into the graphics card on the PCIEX16_1 slot. C. Configuring the Graphics Card Driver C-1. To Enable CrossFireX Function For 2-Way CrossFireX: After installing the graphics card driver in the operating system, go to the Catalyst Control Center. Browse to the CrossFireX menu and ensure the Enable CrossFireX™ check box is selected. For 3-Way CrossFireX: After installing the graphics card driver in the operating system, go to the Catalyst Control Center. Browse to the CrossFireX menu, select the Enable CrossFireX™ check box, and select the 3 GPUs combination. Click OK to apply. C-2. To Enable SLI Function For 2-Way/3-Way SLI: After installing the graphics card driver in the operating system, go to the NVIDIA Control Panel. Browse to the Set SLI and Physx Configuration screen and ensure the SLI con- figuration and Physx is enabled. (Note) The bridge connectors may be needed or not depending on your graphics cards. Procedure and driver screen for enabling CrossFireX/SLI technology may differ by graphics cards. Refer to the manual that came with your graphics cards for more information about enabling CrossFireX/SLI technology. Hardware Installation - 20 -