VRM Overview

The 12+1+1+1 phase power delivery for vCore, iGPU, VCCSA and VNNAON respectively is cooled by two separate heatsinks that feature enlarged fins to increase surface area for better heat dissipation. The VRMs got relatively warm at a peak of just over 61°C, but still a long way from any danger of throttling and this was with a Core Ultra 9 285K. Clearly, being B860, overclocking isn't a consideration either.


Each heatsink cool both chokes and MOSFETs and appear to be practically identical to those on the Z890 model. The heatsink over the I/O shroud can be tricky to remove as it's linked to the I/O shield.


Arranged in a teamed or 'duet' arrangement, the 12 vCore phases are Monolithic Power Systems MPS2414 60 A phases, down from 90 A with the Z890 model, with a further single phase each for iGPU, VCCSA and VNNAON.


The same Monolithic Power Systems PWM controller in the form of the MPS 2425 MP29005-A is used as the MAG Z890 Tomahawk Wi-Fi too.