Marlin doesnt run on the duet boards. They run the reprap firmware. The duet 3 runs at 300mhz. Which is incredible for a 3d printer mainboard. The 2 does not. The SKR pro runs at 168mhz and that is about as good as you are gonna get for the marlin running boards. The SKR 1.3 and 1.4 run at 100mhz and the SKR 1.4 TURBO runs at 120mhz. Sorry I didn't see this until after your purchase. I would have recommended you chase a higher voltage over wattage power supply. These power supplies are not 80 plus and if you get a 500 watt power supply it will likely draw closer to that whenever it is on no matter the load. I just bought a MeanWell HRP-450-24 power supply for my TronXY. This power supply is a low profile power supply. Meant for server or rack mount. 1u height. And this bad boy is 88% efficient. And that matters for machines we leave on and let run for so many hours at a time. But the Meanwell SE-600-24 in my Tevo Black Widow is not 88 percent efficient.