If you don’t need all of that computing horsepower and you want something for hardware transcoding, check out the OTiS build guide. It uses more modern Intel CPUs so you can utilize QuickSync. Of course, that’s assuming your SuperMicro chassis has the standard mounting locations for mATX/ATX boards. And it’ll be much more power efficient than your quad CPU rig too, and cooler too so you could swap those fans.