When replacing a memory module, which part should you avoid touching?

When replacing a memory module, it is essential to avoid touching the memory module contacts. The contacts are the metal connectors at the bottom of the memory module that interface directly with the motherboard's memory slot. Touching these contacts can introduce oils, dirt, or static electricity from your fingers, which can lead to poor connections or even damage the memory module or the motherboard. Proper handling techniques involve gripping the edges of the memory module to ensure a clean and safe installation, while maintaining the integrity of the electrical contacts.

The other parts, such as the memory module casing and label, are designed to be handled without affecting the performance of the module. While it's always good to maintain overall care, they do not carry the same risk as directly touching the contacts. The motherboard itself should also be handled carefully, but touching it does not pose the same specific risk as touching the memory contacts.