The rumor about the RV700 having 800 streaming processors, is hard to kill. But on techpowerup.com there are signs that seem to confirm this rumor.
AMD RV770: It is hard to believe but in this little chip could be up to 850 streaming processors.
But there are other rumors as well. PCZilla reports, that the RV770 got even more than 800 streaming processors. The exact number is unknown but estimated at 840 to 850 shading processors.
But there's a catch apparently. It seems like customers cannot use all the streaming processors, because AMD doesn't activate them, so only 800 are working. It wasn't revealed if those missing processors can be activated later on via hardware adjustment or software.