VRM Overview

Specifications

The ASUS ROG Crosshair VIII HERO (WiFi) features an 8 phase VRM in a 7 + 1 configuration. No doublers are used; instead, two power stages are used in parallel for each phase in order to double the current carrying capacity.


This ASP1405 controller supports the maximum of seven Vcore and one SOC phases. ASUS ditched doublers under the assertion that a blind-parallel VRM design significantly improves transient response times as it does not have to divide the PWM signal from the controller in half for each phase. The real-world results in my testing show generally equivalent performance. There is so much more that goes into VRM design—it is very hard to compare two different implementations. This is, at the very least a cost saving for ASUS as high-quality doublers are not cheap.


The ASUS ROG Crosshair VIII HERO (WiFi) uses the IR3555 from International Rectifier across the board. These 60 A power stages give ASUS a total of 120 A per Vcore phase and also feature over temp and over current protection.

With a maximum theoretical Vcore output of 840 A, the ASUS ROG Crosshair VIII HERO (WiFi) has more than enough for even the top spec AMD Ryzen 3950X under LN2.