Asus Z87-WS - Manual (Page 172)

6-6 Chapter 6: Multiple GPU technology support
Chapter 5
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Enabling Dual CrossFireX technology
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In the Catalyst Control Center window, click Performance > AMD CrossFireX TM .
2. Select Enable CrossFireX TM .
3. Select a GPU combination from the drop-down list.
4. Click Apply to save and activate the GPU settings made.
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