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ASRock X299 Extreme4 (Intel X299) Motherboard Review (Page 3)

By Steven Bassiri from Feb 11, 2018 @ 10:00 CST
TweakTown Rating: 93%Manufacturer: ASRock

Circuit Analysis

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Let's see what the motherboard is hiding under its heat sinks.

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The CPU VRM is in a 10+1 phase configuration, and it uses Intersil's brand new digital PWM the ISL69138, which offers up to 7 phases in flex mode. It is in a five-phase mode and doubled to 10 by adding two drivers on each PWM signal. Each phase uses a 60A inductor along with a Fairchild Semiconductor FDPC5030 PowerTrench Power Clip dual N-channel MOSFET, each rated for 25A. The VCCSA is also controlled by the CPU VRM PWM controller, so it's in 5+1 phase mode.

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We also find that each phase gets an Intersil ISL6596 MOSFET driver located on the rear of the PCB, and we can see that every two drivers have their PWM inputs tied together, effectively doubling phase count from 5 to 10. The VCCIO uses a single phase VRM with an Anpec APW8720 PWM with integrated driver along with one Fairchild FDPC5030.

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Each memory VRM uses two Fairchild FDPC5030 in two phases, and each is controlled by a UPI uP1674 PWM controller with integrated drivers.

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