The most defining characteristic of the AM4 pin layout is its use of a Pin Grid Array (PGA) architecture. Unlike Intel’s mainstream Land Grid Array (LGA), which places fragile contact pads on the CPU and pins on the motherboard, AM4 places the pins directly on the processor. The AM4 socket contains exactly 1,331 pins arranged in a grid pattern with a 40mm x 40mm substrate size.
Understanding the layout is crucial for troubleshooting. Because AM4 uses PGA (pins on the CPU), bent pins are a common failure point. am4 pin layout