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07 Aug 2011  

Windows 7 Pro X64 SP1

Sapphire requires a 450W PSU with one 6 pin PCI-E auxiliary power connector for the 6770. For the 6790, it's two 6 pin connectors, and a 500W supply.

You may be able to use a Molex-to-PCI-E power adapter if your PSU lacks PCI-E power. As you didn't list your PSU type, it's hard to say anything definite.
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