Am4 Pinout Diagram Exclusive _verified_ Jun 2026
Clock signals that synchronize the timing of data transfers.
The 1331 pins are categorized into several "power" and "data" domains: Memory Interface (DDR4) : Connects the CPU directly to RAM.
An AM4 pinout diagram is a dense matrix. To make sense of it, the pins must be categorized into functional clusters. The socket devotes its contacts to four primary duties: power delivery, memory routing, high-speed I/O, and system management.
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: Powers the integrated graphics, memory controllers, and PCIe root complexes.
: 16 lanes dedicated directly to the primary discrete graphics card slot.
If you are diagnosing a system with or unexplained PCIe instability , please let me know: The exact model of your Ryzen CPU Which motherboard chipset you are using (e.g., B450, X570) Clock signals that synchronize the timing of data transfers
The remaining pins handle the delicate logic required to boot, monitor, and protect the system.
Powers the internal DDR4 memory controllers.
This is the lifeblood of your processor. To make sense of it, the pins must
: Dominated by VDDCR_CPU power delivery. A single broken power pin may not kill the system due to massive redundancy.
(Top Edge / CPU Notch) [ Vcore ] [ Vcore ] [ VDD18 ] [ M.2 PCIe ] [ Vcore ] [ PROCHOT] [ RSVD ] [ M.2 PCIe ] [ Vcore ] [ VSS ] [ VSS ] [ Vcore ] [ SOC ] [ SOC ] [ MEM CH A] [ MEM CH A] [ PCIe x16 ] [ PCIe x16 ] [ SOC VSS] [ PCIe x16 ] [ PCIe x8 ] [ MEM CH B] (Bottom Edge - Facing PCIe Slots)
AM4 Socket (LGA) - Top View (Looking down at motherboard socket pins) Pin A1 .................. Pin A40 │ │
: Includes dedicated pins for USB_SS (SuperSpeed) and DP/HDMI outputs for APUs with integrated graphics. Monitoring & Control :