Oh, and in case anyone finds this kind of stuff interesting - Here is an article discussing the new Nvidia 750 TI and it's hash rate. If you notice, it only uses 60W's @ full load versus the 300W a 290. Yes it is a lower hash rate, but imagine having 6 of these on 1 500W psu. The savings in electricity alone would be nice! Fitting 6 on 1 motherboard to make up for the hash rate difference may not be so nice!
Let's wait for coin miners review and experience with the card, not from PC hardware sites that cater for and make money out of gamers.
also you have to keep in mind the 750ti needs to run directly on a 16x slot on the motherboard, making its cost that much higher when you figure in the other hardware you'll need to run a decent quantity of them