8x 290!! I would have that setup too!

however just for curiosity could you put some photo about your mining rig? I'm very interested to know how is set up, it's very hot i suppose..and you have more than 3,5 kw of available electricity in your place, or do you have yor cards in a place that's not you home??
However with that setup you could be considered one of the first wales of MRC! wow!

(just kidding ay!)
well actually atm im only running 7 cards since im waiting for some risers , cards would run too hot with 4 sandwitched together

i have my workstation with watercooling running a unlocked 290 and a 290x ( witch i will be sending back because i want to match memory types)
a old i5 750 rig running 2 xfx 290 with hynix
and a newer i3 running 3 xfx 290 , one hynix 2 elpida , and one not installed yet.
all inside fractal design cabinets , the 2 latter rigs are outside in my garage , 0 deg celcius outside