Yeah I have been warned about that. I have been told as long as BTC stays over 35 range, GPU mining is still profitable.
Can anyone co sign that or confirm that?
I did some math and it sounds about right.\
But there are so many different power usages for each card I am learning from that mining comparison wiki page.
Very interesting page.
Makes me want to buy 7970s
Wrong. 2 factors determine the profitability: 1) Increasing difficulty; 2) Value of 1 bitcoin.
Now you might want to consider more difficulty in 1 week (about 11mil), then you earn even less with GPU's.
Also don't worry too much about the power bill, at the time you should be able to pay it off.
My 6670 uses only 140W at load, so using this 24/7 for a week won't even be in 5$ range.
Lets say you're using 400W, at 0.09kWh/$ (depends where u live), running 24/7 for a month would only equal 26$ in electricity bills.