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ASRock Z370 Taichi Motherboard Review (Page 3)

By Steven Bassiri from Oct 24, 2017 @ 11:35 CDT
TweakTown Rating: 93%Manufacturer: ASRock

Circuit Analysis

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The Z370 Taichi shows us the goods when the heat sink comes off.

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The phases on the Z370 Taichi are in a 10+2 phase configuration for the CPU core and the iGPU phases. The Intersil ISL69138 is used as the PWM controller and supports up to 7 phases on two rails (5+2 here). The main CPU rail gets five PWM channels, and the iGPU rail gets two PWM channels. Each phase gets a 60A inductor and uses Fairchild Semiconductor FDPC5030 PowerTrech Power Clip dual N-channel MOSFETs which are rated for a continuous 25A output, just like NexFETs that are popular. Two APW8720 PWM controllers with integrated drivers are used for the VCCSA and VCCIO single phase VRMs that use the same dual-N channel PowerTrench MOSFETs as the main CPU VRM.

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Each PWM channel seems to output to two ISL6596 N-channel MOSFET drivers for the VCore, which is an odd way of doubling phase count from 5 to 10 for the core phases. The method used here allows for each phase to have its own driver, it's like a better method of doubling up phases compared to two power stages on one driver. The memory VRM uses a UPI uP1674P PWM controller with integrated drivers and outputs to the same Fairchild PowerTrench Power Clip dual N-Channel MOSFETs as used in the CPU VRM.

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