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Unable to power two monitors with one AMD 7970

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Apr 3, 2013
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Motherboard
Gigabyte Z77x-UP5TH
CPU
Intel i7-3770k
Graphics
2x Sapphire Vapor-X 7970 GHz
Mac
  1. MacBook Pro
Classic Mac
  1. 128K
  2. iMac
  3. Power Mac
Mobile Phone
  1. iOS
I have two Sapphire Vapor-X 7970 GHz edition graphics cards connected to two ASUS monitors. I tried powering both monitors with one card (HDMI and DVI); but when I do such the displays are mirrored and I can't move anything displayed on the screens. The GUI freezes, but I can move my mouse pointer. I regain control after I detach one of the monitors, or reattach one of the monitors to the other graphics card. Can anyone help me?
 
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