The Sapphire 7970 standard edition with Vapor X gets 650k/H per second out of the box. But why does my GHZ edition barely do 500 kH/s?
I would really like to know this as well. I have the cards performing at 595 Kh/s after a few hours of fine tuning but they are really sensitive to any changes. Changing to any aggression except 13 throws the cards back to around 400 Kh/s, or lower.