Hola Horrendos, Welcome to the boards...
Are you talking about point-buy?
With Point-buy (it's in the DMG), you start off with a number of points, and buy the attributes you want. The cost for each value of an attribute is:
Score Cost
8 0
9 1
10 2
11 3
12 4
13 5
14 6
15 8
16 10
17 13
18 16
The DM determines how many points the players start out with to buy stats for their character. A normal game is 25 points, a tougher game, 28 points, a hero game, 32 points.
Hope this helps!
AR