It is easy to bend a pin by accident. If you know what the bent pin does, you know if the chip is dead or safe. For example, losing one ground pin might be okay. Losing a memory pin means your RAM will stop working. Designing Motherboards
The PGA design means that dropping a CPU or pulling a cooler off too forcefully can easily bend or snap the gold-plated copper alloy pins. Using a pinout diagram is vital during a repair to know if a bent pin is critical or redundant. Critical vs. Non-Critical Pins
If a pin belonging to the DDR4 memory channels or PCIe lanes breaks, the CPU will suffer permanent functional loss. This usually manifests as a completely dead memory channel (e.g., the PC will only boot with one stick of RAM) or a failure to detect the graphics card. Safe Handling to Protect AM4 Pins