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GIGABYTE X399 Designare EX Motherboard Review (Page 3)

By Steven Bassiri on Oct 26, 2017 03:55 pm CDT - 1 min, 0 secs reading time for this page
Rating: 93%Manufacturer: GIGABYTE

Circuit Analysis


The X399 Designare EX reveals its secrets.


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.


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.


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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Steven Bassiri

ABOUT THE AUTHOR - Steven Bassiri

Steven went from a fledgling forum reader in 2003 to one of the internet's brightest stars by 2010. Armed with an information systems degree, a deep understanding of circuitry, and a passion for tech, Steven (handle Sin0822) enjoys sharing his deep knowledge with others. Steven details products down to the component level to highlight seldom explained, and often misunderstood architectures. Steven is also a highly decorated overclocker with several world records under his belt. He brings that knowledge and experience to TweakTown.

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