I have a couple of old 6990 rigs that are even worse power hogs and they still make a bit on cryptonight. Cryptunit has a nice thread and sute on the more obscure cryptonight coins. His realtime profitability data is excellent compared with whattomine.
your gpu's are profitable with cryptonight which coin?
I've though that we have already ASICS era on cryptonight and GPU's time is over on this algo....