: These pins deliver voltage to the CPU cores and SOC.
AM4 pins measure roughly 0.3mm in diameter. Because they are soldered directly to the CPU substrate, they are highly vulnerable to lateral forces. Thermal paste suction can pull the processor completely out of the socket during cooler removal, bending outer edge pins. Thermal Dissipation Paths
: Unlike standard ground, these are critical for detecting if the CPU is properly seated and for precise voltage regulation.
Since a 1331-pin grid is too large for print text, here is the exclusive "Zone Map" (Motherboard top-down view, notch at the top). am4 pinout diagram exclusive
Because PGA pins are easier to re-solder than LGA pads, enthusiasts use diagrams to identify which "donor" pins can be used for repairs.
| Pin Name | Socket Location | Function | |----------|----------------|----------| | M_A_DQ[0] | AK27 | Channel A data bit 0 | | M_A_DQS[0]_P | AL27 | Data strobe positive | | M_A_DQS[0]_N | AL28 | Data strobe negative | | M_A_CK_P | AH25 | Clock out to DIMM A | | M_A_CK_N | AH26 | Clock complement | | M_B_DQ[0] | AE4 | Channel B data bit 0 | | M_B_ODT0 | AD3 | On-die termination control |
These pins deliver power to the CPU cores. If one of these is missing, you might still boot, but stability under load will suffer. VSS (Ground): : These pins deliver voltage to the CPU cores and SOC
As news of Alex's breakthroughs began to spread, whispers of the exclusive AM4 pinout diagram spread through the hardware community. Some claimed to have seen glimpses of the document, while others speculated about its authenticity.
AM4 is unique because the memory controller is on the CPU, not the motherboard. The pinout diagram shows specific "zones" dedicated to DDR4 communication.
Unlike Intel’s Land Grid Array (LGA) design, which places fragile pins on the motherboard, AMD utilized a Pin Grid Array (PGA) for the AM4 socket. The processor package features 1,331 physical pins arranged in a dense grid, interlocking with the zero insertion force (ZIF) socket on the motherboard. Thermal paste suction can pull the processor completely
What or hardware behaviors are you encountering?
: Matching ground pins surround these lines to prevent crosstalk between Channel A and Channel B during high-frequency operation. 3. PCI Express (PCIe) and Chipset I/O
A1 VDD_33 | B1 PCIe_TX0P (M.2) | C1 PCIe_RX4N | D1 PEG_TX0P | E1 VDD_18 A2 VDD_33 | B2 PCIe_TX0N | C2 PCIe_RX4P | D2 PEG_TX0N | E2 VDD_18 ... A10 VSS | B10 VDD_CORE | C10 VDD_SOC | D10 PEG_RX8N | E10 VSS ... A31 PCIe_RX0P | B31 PCIe_TX0P (FCH) | C31 CLKREQ# | D31 LCLK | E31 RESET# A32 SPKR | B32 SVI2_SCLK | C32 JTAG_TCK | D32 CLKOUT_14 | E32 PROCHOT# ...
| Pin Name | Location | Function | |----------|----------|----------| | PCIE_RX0_P | Y3 | Receive lane 0 + | | PCIE_RX0_N | Y4 | Receive lane 0 - | | PCIE_TX0_P | AA3 | Transmit lane 0 + | | PCIE_TX0_N | AA4 | Transmit lane 0 - |
There is a rectangular "hole" in the center of the grid. This space is used for surface-mounted capacitors on the underside of the CPU to filter electrical noise.