I have just joined the game.
After some fighting and pulling out of hair, I now have a GTX 770 in my main rig and a 7950 in my folding rig.
The 770 wasn't being very friendly when I started folding on it, so gave up quickly. The 7950 went in only a couple of hours ago and is already chewing through its first work unit.
It's only showing an estimation of 66500 PPD, but I was running at stock for a while just to make sure flames didn't come forth from the card.
I have now forced +20% power in the CCC so it is stable at the full boost clock and some clocking will be done within the next little while.
The news that I had grabbed a 7950 before selling the old 560 and 560 ti didn't go down so well... I now have to hope that ebay is friendly with what I get back for them otherwise I'm for the dog house for quite some time :s
FWIW
I got the Sapphire 7950 Flex boost. It was the cheapest 7950 card at dabs (where I get most of my kit in the UK, always been good with returns) along side the Sapphire oc/boost version but came with more bits n bobs... I mean, who can say no to a 'free' HDMI cable?
Oh, also, dabs are/were dishing out a free wireless mouse with Sapphire cards. It's coming in a separate box so I have that to look forward to