Im currently getting 5.0mhs mining neoscrypt with 5 960's pulling ~500W. Thanks to DMJ's coding! And then I have a titan x rig being built(higher end cards depreciate less). Make ROI+50% sell and reinvest in new better hardware has been my formula. If there is no better hardware alternative (which there always will be according to moores law) keep mining. As a reference with the same rig I get~25mhs x11@350W
Also using yvg's yam cpuminer on an lga 2011 x97 based board with a xeon phi for x11 mining is a great idea im trying out.
a titan x rigs ? how many titan x does this mean ?
(considering it is a 1000usd (or 1300euro... go figure...) card...
I think you should wait for the 980ti which will have the same performance for roughly half the price... (and a mining rig does not need 12Gb of vram)
(meaning the titan x will depreciate like the Z did since it is stuck between true gaming cards and true professional card)
but should be interesting with its 384bits mem bus... and 1000 more cuda cores than the 980 (but again those spec. will remain in the 980ti)