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The turbo boards can handle the same motors (and if they use regulated power back to the board, even bigger ones), as they are using even more powerful FETs than the combined smaller stock-sized FETs (although you usually stack a higher grade of FETs of the same size). The reason being is that a FET stack allows the motors to handle more power, but you are still sending higher voltages to the board. Ditto for a turbo board that solders to the FETs. A regulated board intercepts the power before it ever gets to the board and ensures only 5V ever go to the board, with any extra voltage going to the motors only. Because of that, a turbo can handle ungodly voltages while still giving you very very smooth steering, since the steering servo is onlhy being powered by 5V.
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