Am4 Pin Layout __full__ May 2026
The AMD AM4 socket is a Pin Grid Array (PGA) interface featuring 1,331 pins. Unlike Intel or newer AM5 sockets where pins are on the motherboard, AM4 pins are located directly on the underside of the processor. 1. General Pin Map & Organization
: Handles high-speed data for GPUs and NVMe SSDs. A typical Ryzen CPU provides 24 PCIe lanes , with 16 dedicated to graphics and 4 to storage. Integrated Graphics I/O am4 pin layout
- FCH Link (Promontory): 4 PCIe lanes (or equivalent proprietary link) connecting the CPU to the chipset (B350, X570, etc.).
- SATA: ~12 pins for up to 2 native SATA ports from the CPU (most SATA comes from the chipset).
- USB 2.0: 2 pins for a single USB 2.0 root hub.
- NCT (Temperature Sensing): Pins for external thermistors.
- PROCHOT (Processor Hot): A critical single pin. If the motherboard asserts this pin, the CPU instantly throttles to minimum frequency to prevent thermal damage.
8. Comparison to AM5 (LGA)
| Feature | AM4 (PGA) | AM5 (LGA) | |---------|-----------|-----------| | Pin count | 1331 | 1718 | | CPU pins | On CPU | On motherboard | | Bent pin risk | High (CPU) | Moderate (socket) | | Max current | ~150A | ~230A | | Memory | DDR4 only | DDR5 only | The AMD AM4 socket is a Pin Grid
2. Pin Categories and Functional Zones
The 1,331 pins are not just generic connectors; they are divided into specific "lanes" that carry power, data, and control signals. The density of the AM4 pin layout is high, leaving very little unused space. FCH Link (Promontory): 4 PCIe lanes (or equivalent