Right now it's been junked out because the difficulty level is out of whack, due to all the ppl that were mining prior to Mar 1st.    It should be better once difficulty adjusts... then I guess you just wait for the next "DAC"...  but CPU performance vs GPU isn't unreasonable and it *used* to be profitable, even w/ the 4000 c/m GPU miners...  profitable, as in, you could actually get dedicated servers & make money off of them (if you knew where to get them from and/or if you know some host that you can get a good bulk deal from)