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ASUS ROG Crosshair VI Hero (AMD X370) Motherboard Review

By: Steven Bassiri | Socket AM4 in Motherboards | Posted: Mar 20, 2017 1:08 pm
TweakTown Rating: 93%Manufacturer: ASUS

Circuit Analysis

 

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The Crosshair VI Hero looks slick without the heat sinks.

 

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The VRM on this motherboard is in an 8+4 phase configuration. The four phases starting at the "Socket 1331" PCB marking area are for the SOC voltage for the CPU, while the remaining eight are for the CPU's main core voltage. A single PWM, marked ASP1405, is used, and it provides 4+2 phases which are doubled to 8+4 through the use of doublers and drivers.

 

The ASP1405 is most likely an IR35201(6+2) or similar International Rectifier (recently acquired by Infineon) digital PWM, which would be an upgrade to what ASUS uses on their Z270 motherboards. The use of this type of PWM is warranted considering Ryzen's high VRM power requirements when the CPU is overclocked on all cores.

 

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Each of the CPU's main and SOC voltage rail phases gets its own Texas Instruments CSD87350Q5D NexFET power block. These power blocks integrate the high-side and low-side MOSFET into a single package, are rated at 25A continuous output at 90% efficiency and can operate upwards of 40A. They are what have been used on high-end Intel motherboards for a while, and it is nice to see ASUS use them here.

 

The inductors are ASUS's micro-fine alloy model, and the capacitors are 10K FPCAP Japanese solid-polymer capacitors. The tiny ICs in the back of the VRM area of the PCB are IR3599 doublers/quadruplers used as doublers. Each IR3599 takes in a single PWM signal and outputs two. The two PWM signals from each IR3599 go to two IR3535 single phase drivers that then control the NexFETs.

 

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The memory VRM on this motherboard is identical to that of the Maximus IX Apex, ASUS's top Intel overclocking motherboard. Each of the two phases uses a single high and low-side MOSFET, and the phases are controlled by an ASP1103 PWM (unknown origin).

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