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MSI X399 GAMING PRO CARBON AC TR4 Motherboard Review (Page 3)

By Steven Bassiri from Sep 7, 2017 @ 12:25 CDT
TweakTown Rating: 92%Manufacturer: MSI

Circuit Analysis


The X399 GAMING PRO CARBON AC shows off its goods.


The VRM for the core of the CPU is actually a 10-phase VRM. We typically see 8-phase VRMs, but MSI has decided to increase the number of power stages and reduce the number of true phases to help spread out heat load among more components.

The fully digital IR35201 PWM controller outputs 5 phases to doublers that then output two power stages. The power stages are International Rectifiers IR3555, and they are fully integrated 60A power stages. I am not sure on the specifications of the inductors.


PWM phase doublers are located on the underside of the PCB; they are IR3599 operating in doubler mode. We can also see the tantalum capacitors on the back of the PCB, and the doublers and capacitors are covered by a metal heat sink. The SoC VRM is made up of three IR3555 60A PowIRstages, and they are controlled by an IR35204 digital PWM controller.


Memory VRMs for each of the four DIMMs use a Primarion digital PWM controller, the PV4210. The power stages are made up of two phases of Texas Instruments CSD87350Q NexFET dual N-channel 40A MOSFETs. The memory VRM on MSI's X399 motherboard is identical to that of MSI's X299 motherboard.

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