How good would this 6850 be?

[mute20]

I am not gonna be a dedicated miner ,but what speeds should I expect. Also how high do you think I can overlock this?

http://www.newegg.com/Product/Product.aspx?Item=N82E16814131374

[nafai]

My roommate has a 6850 and gets 225 mhash/sec with it.

You can also check here: https://en.bitcoin.it/wiki/Mining_hardware_comparison

[Dargo]

About 250 Mhps.

https://en.bitcoin.it/wiki/Mining_hardware_comparison

A 5850 would be a better choice in your price range (~400 Mhps):

http://www.ncix.com/products/?sku=60714&vpn=11162-15-20G&manufacture=SAPPHIRE

Also, I have read some not so favorable reviews of Powercolor cards on this forum - Sapphire or MSI seem to be the best for mining.

[bmgjet]

Get 277Mhash with 990mhz core, 300 with 1040mhz core.

[mc_lovin]

That would get you around 0.1-0.15 BTC per day.