If you read carefully, it's noted that 0.77W/GH would be ceiling due to node jump, not taking any optimization or correction into consideration. The actual numbers are lower, and the ~0.6W/GH was number we decided that was closest to reality + error margin.
Regards,
Nasser
How do you have actual numbers for something that will not exist for months? Its just a thought experiment. Please try to use BFL-speak, you have pre-orders on the line.