VRM Overview

Specifications

High-resolution is available (front). Feel free to link back to us and use these in your articles, videos or forum posts.


The Gigabyte X670 AORUS Elite AX features a 16+2+2 phase VRM configuration. These are setup in as "teamed" power stages, resulting in every two receiving the same PWM signal.


Gigabyte is using a Infineon XDPE192C3B PWM controller to drive the Gigabyte X670 AORUS Elite AX power stages.


The Gigabyte X670 AORUS Elite AX uses Infineon TDA21472 power stages for the 16 Vcore phases. These power stages each support a maximum of 70 A of continuous current. For the SoC phase, Gigabyte is also a pair of Onsemi NCP303160 (60 A) power stages.

While the Gigabyte X670 AORUS Elite AX has a maximum output of 1,120 (A) dedicated to Vcore, this can change depending on temperature and load. For once, the Datasheet is available through a Google search. The Datasheet can provide efficiency curve and maximum operational temperature information. It also can help explain why so many MOSFETs are used if the peak current (amps) of a stock AMD 7950X is only around 180. On paper, that would make this motherboard and many more complete overkill. However, using the datasheet, some interesting things should be pointed out. Infineon shows the efficiency drops to 85%~ at 100% load, but the output current has a steady decline as the MOSFETs warm up too. With the highest temperature recorded of 60 °C during the VRM load testing, the actual current output is closer to 50. This means 1,120 Amps turns into 800 when under a full load during our testing. Still a bit of overkill, but it does allow this motherboard to work in many types of temperature environments.


On one end of the VRM setup is the VDD_MISC power. This is using two Renesas ISL99390 (90 A) power stages and a Renesas RAA 229621 for the controller. Something to note here is that one of these power stages is a actually a ISL99380 (80 A). Did Gigabyte run out of 90 A MOSFETs during manufacturing? Either way, it's a mishap, but not a serious problem for this specific sample.