ECS P55H-AK Manual page 64

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B. For 3-way configuration, two CrossFire Bridges are needed to connect the
three graphic cards.
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3. Connect the cable from your monitors to the CrossFireX ready graphics card
installed on the PCIEX16_1 slot.
Monitor Cable
4. Connect an auxiliary power source from the power supply to the graphics cards.
ATI CrossFire Technology Support
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