Been mining with the ATI5570 card for 13.7 days now; have earned 1.339BTC ($USD19.42) in that time, or about $1.41/day. Electricity costs are about $0.30/day, leaving a whopping profit margin of $1.11/day.
On the +ve side the effective value of the card is pretty much covered, if I had to I could fairly easy sell it at 30% less than retail.
I'm assuming the difficulty level went up which is why I'm earning less per day than I calculated at the start of it...
The micro mining experiment continues.
