"Hi, I've 8 ATI 5870. I'm mining at 3.1 GHash/s \r\nSome calculator tell me that i shuld generate a block in 22 days... is true ? I've some probability to take some bit coin or is better thar i log into a pool ?"
There are differing arguments on the right number but if you aren’t generating a block in about a week, you should be in a pool.