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ASRock Fatal1ty Z170 Gaming-ITX/ac (Intel Z170) Motherboard Review (Page 3)

By: Steven Bassiri from Dec 22, 2015 @ 11:49 CST
TweakTown Rating: 94%Manufacturer: ASRock

Circuit Analysis

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The Fatal1ty Z170 Gaming-ITX/ac has a 6+2 phase VRM for the CPU + iGPU phases, and a linear regulator is used for the VCCSA and VCCIO. Each of these phases gets a 60A power inductor, and there are tantalums used for the output filter. This VRM looks high quality even without removing the heat sinks, but removing the heat sinks (that cool the CPU phases) reveals some high-quality integrated MOSFETs.

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Each iGPU and CPU phase gets a Texas Instruments NexFET CSD87350Q5D, which is a 25A high-efficiency dual-N channel MOSFET. Instead of two or three MOSFETs per phase, the high-side and low-side MOSFETs are packed into a single thick chip. The International Rectifier IR35201 is a 6+2 phase high-quality digital PWM found on high-end overclocking and server motherboards. In this case, all the phases are used. Four (1+3) IR3598 (dual driver and/or doubler) are used as dual drivers. Each phase gets its own PWM rail, so this is a true 6+2 phase VRM, which is better than most full sized ATX boards.

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The memory VRM is a single phase driven by a single phase analog PWM and utilizes two highly integrated Fairchild MOSFETs. It's good enough to support DDR4 4000MHz (I tried, and it worked fine).

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