are these two cards compatible with each other?
1: http://www.amazon.com/GDDR5-technology-Graphics-Cards-HD7770-2GD5/dp/B0088PK040/ref=sr_1_1?s=pc&ie=UTF8&qid=1381873934&sr=1-1&keywords=hd+7770
2: http://www.amazon.com/Sapphire-Radeon-PCI-Express-Graphics-11201-17-20G/dp/B00A0HZOEA/ref=sr_1_20?s=pc&ie=UTF8&qid=1381870356&sr=1-20&keywords=hd+7850
1: http://www.amazon.com/GDDR5-technology-Graphics-Cards-HD7770-2GD5/dp/B0088PK040/ref=sr_1_1?s=pc&ie=UTF8&qid=1381873934&sr=1-1&keywords=hd+7770
2: http://www.amazon.com/Sapphire-Radeon-PCI-Express-Graphics-11201-17-20G/dp/B00A0HZOEA/ref=sr_1_20?s=pc&ie=UTF8&qid=1381870356&sr=1-20&keywords=hd+7850
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