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ASUS ROG ZENITH EXTREME (AMD X399) Motherboard Review (Page 3)

By: Steven Bassiri from Sep 4, 2017 @ 10:50 CDT
TweakTown Rating: 94%Manufacturer: ASUS

Circuit Analysis


The ROG ZENITH EXTREME is one of the most loaded X399 motherboards, circuit wise.


We get a true 8-phase VRM that uses 8 PWM channels directly from an ASP1405 PWM, which is similar to an IR35201. The same digital PWM was used on ASUS's high-end Z270 and X299 motherboards. There is also a gold contact switch that will let the system know you have installed the custom water block (which has its own header) or have removed the VRM heat sink (it does one of the two). Each phase uses a 60A IR 3555M PowIRstage, MicroFine Alloy chokes, tantalum POSCAPs, and 10K capacitors.


The SoC rail uses another ASP1405 as the digital PWM controller along with three phases that use Texas Instruments CSD97374Q4M NexFETs rated for 25A. An Anpec APW8713 is a fully integrated 8A buck converter used for some minor CPU rail.


Both memory VRMs use ASP1103 PWMs along with two power phases. Each power phase gets a single high-side and low-side FET. I am not sure on the exact model of the MOSFETs, but they should get the job done as I have seen them on other very high-end ROG motherboards targeted at overclockers.

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