Am4 Pin Layout 2021 Jun 2026

If you look at the bottom of an AM4 chip, you will notice a 2x2 grid of "missing" pins in the top-left corner (relative to the triangle) and 3-pin gaps in others. This ensures the CPU only drops into the socket when oriented correctly.

If you look at an AM4 CPU, you will notice several empty spaces (holes in the pin grid). These are reserved pins (RSVD) or "no connect" (NC) pins. AMD uses the same substrate for EPYC embedded and Ryzen desktop, so some positions simply do nothing on consumer chips. am4 pin layout

Power pins are arranged in interlaced "checkerboard" patterns with ground pins to reduce electromagnetic interference (EMI). If you look at the bottom of an

The most common pin type, providing a return path for electrical current. These are reserved pins (RSVD) or "no connect" (NC) pins

Supports up to 24 PCIe lanes (PCIe 3.0/4.0 depending on the CPU generation).

Important practical notes: