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MSI Z390 Gaming Edge AC (Intel Z390) Motherboard Review (Page 3)

By Steven Bassiri from Dec 4, 2018 @ 10:00 CST
TweakTown Rating: 91%Manufacturer: MSI

Circuit Analysis


The Z390 Gaming Edge AC shows us the goods with the heat sinks removed!


The VRM is a 10+1 phase VRM which is achieved by doubling the number of power stage components on each of the four drivers for the CPU. The UPI uP9521 is a 4+3 phase PWM controller, but it's somehow in a 5+1 phase mode, as there is only one iGPU phase and five CPU VCore phases.

We faced the same mystery on MSI's Z370 motherboards, so perhaps this is a different version of the PWM, or it can reallocate PWM channels. The iGPU phase is in a two-low one high MOSFET configuration.


The drivers for the CPU VCore phases are located on the rear of the motherboard. The memory VRM uses an RT8125 ("8Y=") PWM controller with three On Semi. 4C024N MOSFETs in a two-low one high configuration.

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