HoloDust on 31 May 2013
Tom's Hardware will soon have (yet another) article on the subject. Back in the day it was lucrative, but this comment from latest nVidia 770 review maybe explains current situation well:
"I can tell you a story about how a pair of 7970s at 1070 MHz mining 24/7 only make 0.03 BTC/day and dwindling.... so yeah... the GPU gold rush is over. 7970s will no longer pay for themselves in any appreciable way with BTC mining."
