AM4 (PGA 1331) socket is a 1331-pin zero-insertion force (ZIF) socket used for several generations of Ryzen and Athlon processors. Because the pins are located on the CPU itself, understanding the pinout is critical for diagnosing performance issues or deciding if a broken pin is catastrophic. Pinout Categories and Functionality
- Red Zones: Voltage Inputs (VDD, 12V, etc.)
- Black Zones: Ground (VSS)
- Blue Zones: High-Speed Data (PCIe, DDR4)
F. SVI2 (Serial Voltage Identification Interface 2.0)
- AL6: SVI2_SCLK
- AL7: SVI2_SDATA
- AL5: SVI2_ALERT (optional)
- Bi-directional, 3.3V logic, controls VRM for VDD and VSOC.
B. DDR4 Memory Interface
A significant portion of the pinout, usually located on the edges of the socket, is dedicated to the dual-channel DDR4 memory controller.