I know that the general consensus is that the 5830 is the best card for mining.  However, looking at the chart https://en.bitcoin.it/wiki/Mining_hardware_comparison it looks like the 5770 has a better MHash/J rating than the 5830.  I know the 5830 can pump out more MHash/s, but is it true that the 5770 is more efficient?  There are a lot of numbers missing on that chart for both 5770 and 5830 cards.  I just want to know which card will put out more MHash per watt.