Over the last week or so I started noticing that I when using the deepbit pool my collective Mhash rate was not reflecting the correct total for the number of cards I have in total. There were times when it was as much as 30-40 percent lower than it should have been. I created a different worker for each video card and the problem has resolved itself. This is only my experience but I thought I would post this message in case anyone else may have the same issue.
BK