VRM Overview

The VRMs feature 14+1+1+1+1 phases with the 14 for vCore and single phases for items such as iGPU, VCCSA and VNNAON. The VRMs are cooled by two large separate heatpipes that did a decent job in testing with our Core Ultra 285K CPU, only peaking at 57°C and since this is the most powerful Intel CPU for now at least for LGA1851, this is a clear pass for ASRock.

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The board uses a Richtek RT3638AJ PWM controller that sits to the left of the upper bank of power phases. The heatsink design is fairly basic, but the heatsinks makes good contact with the VRMs and got very warm during testing so is definitely doing the job well.


There's a mixture of power phases here, with the least populous being SM4503NH 80 A and less powerful SM4508NH. These feed the likes of the iGPU, VCCSA and VNNAON.


The main left and right banks of VRMs are all 80 A Vishay SiC659 phases - 14 in total and exclusively feed the CPU vCore.