Building a 4x 7950 rig would be ~$2000, give or take, would hash ~2Gh/s, and would take about 6 months to pay off at the current difficulty. But we can probably expect the difficulty to be up by 50% in six months, if not more. If I could build it for ~$1000 it would make a better cost proposition, but at twice that it's not very effective against $300 5Gh/s miners coming online now.
Same here... I'm targetting the services industry rather than mining or trading; hoping to get a few more games etc online
Are you guys not doing it because of the initial cost for building GPU rigs or because of the looming threat of ASIC? I made my first two rigs last month, one with four 7950s and one with two 5970s. They've been pumping out about 4gh/s and I've made about 4 BTC. Subtract the cost of electricity and one of the 7950s has paid for itself already. I also didn't have all the cards up and running on the same day, more like a week in between the first and last two 7950s. I expect this month to be a little better.
No. I have determined that, for myself, it's cost-prohibitive and would probably not net any profit.
So, anyone building some new rigs?
Same here... I'm targetting the services industry rather than mining or trading; hoping to get a few more games etc online
Are you guys not doing it because of the initial cost for building GPU rigs or because of the looming threat of ASIC? I made my first two rigs last month, one with four 7950s and one with two 5970s. They've been pumping out about 4gh/s and I've made about 4 BTC. Subtract the cost of electricity and one of the 7950s has paid for itself already. I also didn't have all the cards up and running on the same day, more like a week in between the first and last two 7950s. I expect this month to be a little better.