Is there a good chance that dropping $400-500 on dual 6950's would pay themselves off within a month or two?
paying off the hardware I think would be all really *require*, and I think this is kind of a fun experiment to see where it leads.
i'm guessing that 2x 6950's would net me around 675-700 mhash/sec (someone please correct me on this if wrong)
factor in a.) expenses b.) vs profit..
as far as b is concerned, at ~700mhash/s you'd probably earn under 20 btc a month (i'm completely estimating). assuming exchange rates hover around 20, that'd be approx $400 a month
so the question goes back to a.), is your electricity bill going to be under 400 a month with the extra use of electricity/cooling/etc (not factoring the initial expense of card purchase/install/time spent installing it).