A 6850 should generate somewhere around 250 MH/s, which will produce bitcoins equal to about $1.20 (USD) per day of full time mining, at current prices and difficulty.
It won't be very long before ASICs drive the difficulty up several fold, which will drop the revenue to pennies per week, as Huxley mentioned.
Well, it looks like I learned about bitcoins at the very wrong time. It won't be very long before ASICs drive the difficulty up several fold, which will drop the revenue to pennies per week, as Huxley mentioned.
