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ASUS ROG Maximus VIII Formula (Intel Z170) Motherboard Review (Page 3)

By: Steven Bassiri from Mar 2, 2016 @ 8:19 CST
TweakTown Rating: 93%Manufacturer: ASUS

Circuit Analysis


I think all motherboards are more interesting when their heat sinks come off.


This VRM is made up of high-quality components. ASUS is using their micro-fine alloy inductors and their 10K gun-metal colored polymer capacitors. This VRM is in an 8+2 phase configuration and is controlled by a single PWM.


The single ASP1405, which is an unidentified International Rectifier PWM (most likely IR35201 or IR35203) provides 4+2 phases. The first four phases are doubled to eight phases by four IR3599 phase doublers. Those four doublers then feed the eight PWM lines to eight IR3535 MOSFET drivers. Each MOSFET driver controls a high-quality Texas Instruments CSD87350 NexFET, which produces high-quality output power. The NexFETs are power blocks; each has one high-side and one low-side MOSFET built-in, and they provide high efficiency at high switching frequencies, which is great for overclocking. The iGPU gets the remaining "+2" phases and utilizes two IR3535 and two more NexFETs.


The VCCSA gets power from a single phase VRM powered by an APW integrated PWM and some ON-Semi PowerPAKs. The VCCIO and DDR-VPP get power from two separate TPS51362 Texas Instruments 10A step-down integrated power converters. The memory VRM is controlled by an ASP1105 (unknown 2+ phase PWM) and is powered by two phases made up of unidentified MOSFETs. I have seen these MOSFETs before, and they do a fine job of powering the memory DIMMs.

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