Asus GTX 680- How many power connectors?

I have a Asus GTX 680 and it has 2 PCI-E 6 pin power sockets. Do I need to connect two 6-pin connectors from my PSU or just one is sufficient?

The manual says nothing about how many to connect.
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  1. you have to connect both for the card to work
  2. Right. Thanks
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