You can mine about 0.03 BTC/day at 190 Mh/s (according to 50btc's pps calculator)
Radeon 6770 uses about 100 watts
Assuming the rig uses 150 watts total and an electric cost of $0.10/kwh, you'd use about $10.80/month in electricity
0.03 BTC/day * 30 days per month = 0.9 BTC/month
At current exchange rate, 0.9 BTC = $12.08
Estimated monthly profit = $1.28
I guess you basically get some free heat if you decide to mine, haha
lmao "free heat", well i guess since winter's coming it's not that bad.. xD