Am4 Pinout Diagram [2026]

The AM4 pinout is organized into a grid (typically labeled A-AM on one axis and 1-40 on the other) to handle power delivery, data transfer, and communication with peripherals. Key pin functional groups include:

Requires professional microscopic micro-soldering to donor a replacement pin onto the pad.

(ground) pin may sometimes allow a PC to boot, but it can lead to instability or disabled memory channels. Memory Channels

Roughly one-third of the pins on an AM4 processor are dedicated exclusively to delivering clean, stable electrical current. High core-count processors like the Ryzen 9 5950X pull massive amounts of current, requiring distributed power pins to prevent overheating individual points on the substrate. am4 pinout diagram

Note: AMD has never released an official public pinout to OEMs, but the enthusiast community, including engineers from der8auer and Gamers Nexus, have reverse-engineered near-perfect diagrams based on AM4 technical reference manuals.

| Pin Type | Label Example | Primary Function(s) | | :--- | :--- | :--- | | | VSS | Electrical Ground | | VDD (CPU Core) | VDDCR_CPU | Main voltage for processor cores | | VDD (SoC) | VDDCR_SOC | Voltage for memory controller and Infinity Fabric | | VDD_18_S5 | VDD_18_S5 | Standby power for sleep state | | Memory | DQ0, CA, CK | Data, command, and clock for DDR4 | | PCIe | PCIE_TX0_P/N | High-speed data to GPU and NVMe | | DisplayPort | DP_* | Video output from APU |

The CPU should fall into the socket effortlessly under its own weight. If you must press down, a pin is misaligned or bent. Diagnostic Guide: Dealing with Bent or Missing AM4 Pins The AM4 pinout is organized into a grid

Labeled using letters (A to AZ, skipping letters like I, O, Q, and U to prevent confusion). Columns: Labeled using numbers (1 to 39).

These are the critical "logic" pins that tell the system to start up. Helpful Resources for AM4 Diagrams

: Labeled often as P_GFX , these pins provide the high-speed lanes for your graphics card and NVMe SSDs. Depending on your chipset (e.g., B550 or X570), these support up to PCIe 4.0 speeds. Voltage and Power (VDDCR/VSS) : VDDCR_CPU : Supplies power specifically to the CPU cores. Memory Channels Roughly one-third of the pins on

On the top surface of the CPU, one corner features a small gold triangle. On the underside, this corresponds to a missing pin blank space in the grid pattern.

The pinout diagram for AMD's AM4 socket is not an officially published document for the public. However, a comprehensive and accurate community-sourced diagram is available.