VRM Analysis
The X870-A Gaming WiFi is an ATX board featuring a standard 8-layer PCB, which is typical for boards of this size and doesn’t require the additional layers often seen on smaller ITX boards.
The 16+2+2 power delivery system is built around the Infineon ASP2206 PWM controller, which handles the bulk of the VRM phases. ASUS has utilized this controller before in their X670/X670E series, where it has proven effective in delivering stable power under heavy workloads. The X870-A employs MPS MP87691 90A Smart Power Stages (SPS) for the primary phases, a reliable choice also seen in high-performance boards across previous generations.
For the miscellaneous phases, ASUS uses Vishay SiC629 80A power stages, another part that has been used successfully on X670E boards such as the Crosshair Hero, showcasing its ability to handle demanding loads.
Additionally, the Richtek RT3672EE synchronous buck controller manages the single miscellaneous phase, a component commonly found in both X670 and X670E boards, ensuring compatibility with AMD’s SVI3 power delivery requirements.
