The trio all features an integrated I/O shield. The Pro and Elite share the same power-delivery consisting of a 12-phase supply to the CPU plus another two for the SoC. In detail, the boards use a six-phase Intersil ISL229004 PWM that’s doubled and connected to 12 Vishay SiC651C phases each capable of 55A. These appear to be unique to B550 as the Aorus X570 boards use different setups.
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