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GIGABYTE X399 Designare EX Motherboard Review

By: Steven Bassiri | Socket TR4 Threadripper in Motherboards | Posted: Oct 26, 2017 8:55 pm
TweakTown Rating: 93%Manufacturer: GIGABYTE

Circuit Analysis

 

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The X399 Designare EX reveals its secrets.

 

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We get a true 8-phase VRM. Eight IR3556 are used, each is a 50A fully integrated (driver plus FETs) PowIRstages, and controlled by a fully digital IR35201 PWM controller in 8+0 phase mode. The inductors are rated for a maximum saturation current of 76A, and tantalum POSCAPs on the rear complete the LC (inductor/capacitor) filter circuit.

 

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The SoC VRM is controlled by an IR35201, which handles two IR3556M 50A power stages and the same 76A inductors. The memory VRM uses an IR3570 3+2 phased digital PWM controller and two IR3553 (40A) PowIRstages for the main DDR4 voltage rail and one IR3553 for the DDR4 VPP.

 

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Here we have the second memory VRM that uses the IR3570 digital PWM in a 2+1 phase mode. It controls two phases that make up the main DDR4 voltage, and one phase that most likely is for the DDR4 VPP rail (overkill). The Richtek RT8288A controller is used for GIGABYTE's DAC-UP 2 feature, which allows you to disable USB 3.0 voltage and only allow for data, or even boost the voltage above 5v.

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