Just got a second 7950 HD, not working, xifre help.

Or it could be that, when idle, like with single cards, that drops down to save power. Only way to tell is to put a load on both cards.

You're right ED. I forgot about the power saving features of newer cards.

I would strongly advise you use AMD's new driver uninstaller, remove any manually installed DAP packages seperately and then install the latest WHQL package or 13.2 betas as you really shouldnt have needed to run any games to make the CCC software work.