: Memory controller pins. Losing one of these usually results in a dead memory channel (e.g., your PC only recognizes one stick of RAM). P_GFX / PCIe
Limitations and caution
If you are probing your AM4 socket or CPU pins: am4 pinout diagram
Maya looked closer. The diagram was a symphony of colors. Yellow for the lanes—sixteen of them, plus four for the NVMe drive, all whispering directly to the processor like private phone lines. Blue for the DDR4 memory channels, twisted and paired so precisely that a single millimeter of trace length difference could cause a system to crash at 3600MHz. : Memory controller pins