SMD 5050 LED 32.8' with 24v powersupply
Some strips come in 6 or 5 LEDs per segment like the one in the attached picture, and those LEDs are connected in series with a resistor (~330 Ohm), each color has its own power line and its own resistor per segment. So for such strip you need 24v, while more Amps will allow you to connect more segments/roles to the same controller.