Super Saiyan 3 is the stopping point for most Saiyans, and most Half-Saiyans don't make it this far. It varies from it's previous state in three major ways, the hair is much longer, flowing down their backside, they have no eyebrows, and their power is four times what it was in Super Saiyan 2, and eight times what it was in Super Saiyan.

Power Multiplier: 400x Base Power Level