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GIGABYTE AX370-Gaming 5 (AMD X370) Motherboard Review (Page 3)

By Steven Bassiri from Mar 27, 2017 @ 22:40 CDT
TweakTown Rating: 93%Manufacturer: GIGABYTE

Circuit Analysis


I present the AX370-Gaming 5 without heat sinks.


Check out the VRM. I expected some PowerPAKs, but instead, I get IR PowIRstages and an IR PWM controller. Infineon recently acquired International Rectifier (IR), and their portfolio of high-end digital PWM controllers, power stages, and power stage accessories. GIGABYTE has used a full steam International Rectifier solution for the power stages; the output filter design is different than Intel. The main PWM is the famous digital PWM from IR, the IR35201, which can operate in 8+0, 7+1, or 6+2 phase modes. In the case of the AX370-Gaming 5, it's operating as a 6+2 phase PWM controller.

Each PWM channel for the CPU's main voltage rail goes directly to the IR3553 40A fully integrated power stage. That would make the CPU core voltage VRM is a true 6-phase VRM. The SOC voltage rail gets two PWM channels, which are then routed to two IR3599 PWM channel expanders, that output four PWM channels for four IR3553. In the end, you get a 6+4 phase VRM that uses top-shelf power stage components.


The memory VRM is similar to that of mainstream Aorus Z270 motherboards, a single phase VRM consists of three ON Semiconductor NTMFS4C10N in a doubled low-side configuration controlled by a Richtek RT8120D. It shouldn't hold back memory overclocks, I have seen this configuration take memory close to 4GHz on Z270 motherboards.

USB DACP-UP 2 impliments a voltage regulator for each set of two USB 3.0 ports/headers. The voltage regulators are the RT8288A 4A step-down converters.

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