| Feature | AM4 | AM5 | | --- | --- | --- | | Type | PGA | LGA | | Pins on | CPU | Motherboard | | Total contacts | 1331 (nominal) | 1718 | | Memory | DDR4 | DDR5 | | PCIe | Gen 3/4 (CPU dependent) | Gen 5 native | | Triangle key | Yes | Yes (but smaller LGA key) |
This article provides an exhaustive breakdown of the AM4 pin layout, including physical dimensions, pin counts, functional groups, differences from Intel sockets, and practical advice for handling pin-related issues. Before diving into the specific coordinates of the AM4 pin layout, one must understand the underlying physical architecture. AM4 uses PGA (Pin Grid Array) . In this design, the pins are located on the underside of the processor (the CPU), while the motherboard provides spring-loaded sockets (holes) to receive them. am4 pin layout
| Function | Approximate Location (Row, Column) | | --- | --- | | VDDCR_CPU (core power) | E15 to AE25 (large central block) | | VDD_SOC | H8 to N12 (near bottom-center) | | VSS (ground) | Interspersed, but heavy at edges | | DDR4 Channel A DQ0 | B12 (bottom left edge of active area) | | DDR4 Channel B DQ0 | B24 | | PCIe x16 Lane 0 RX | U3, U4 | | PCIe x16 Lane 0 TX | AA3, AA4 | | Reset_L | V28 | | PROCHOT | W30 | | SVI2 data | AJ10 | | 100MHz REFCLK | K31, K32 | | Feature | AM4 | AM5 | |