The Z270 Extreme4's bare PCB exposes how it all works.
The motherboard's VRM for the CPU is a 6+4+1+1 phase VRM. The iGPU gets four phases, and the CPU VCore gets six, both doubled from 2+3 phases through doubling of power stage components. The last 1+1 are phases for the VCCSA and VCCIO and don't work off the main PWM controller. The PWM controller is an Intersil ISL95824, which is a 4+2 phase PWM with one integrated driver on the 2 phase rail and two integrated drivers on the 4 phase rail.
ASRock supplements the integrated drivers with two ISL6625A drivers, one for each rail. The 3+2 drivers are each attached to two power stages consisting of NIKOS PK6188 for the high-side and PZ0903 for the low-side. While 6+4 phases might not sound like a lot, it should get the job done since LGA1151's power requirements aren't crazy high.
The memory VRM consists of two phases controlled by an Anpec APW8720B single-phase PWM controller. The two phases are derived by doubling the number of power stage components on the single integrated driver, and the MOSFETs are Advanced Power Electronics Corp. AP4034GYT N-channel power MOSFETs.
The motherboard is much more revealing when you take off the shields and heat sinks.
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- Page 1 [Introduction, Specifications, and Pricing]
- Page 2 [Packaging and Z270 Extreme4 Overview]
- Page 3 [ASRock Z270 Extreme4 Circuit Analysis]
- Page 4 [ASRock Z270 Extreme4 Circuit Analysis Continued]
- Page 5 [BIOS and Software]
- Page 6 [Test System Setup]
- Page 7 [Overclocking]
- Page 8 [CPU, Memory, and System Benchmarks]
- Page 9 [System IO Benchmarks]
- Page 10 [Thermal Imaging and Power Consumption]
- Page 11 [What's Hot, What's Not & Final Thoughts]