[Answer] What is the purpose of the notch in the memory module and the tab in the memory slot on the system board?

Answer: Ensure the module is installed properly
What is the purpose of the notch in the memory module and the tab in the memory slot on the system board?

On the bottom edge of 168-pin DIMMs there are two notches and the location of each notch determines a particular feature of the module. The first notch is the DRAM key position which represents RFU (reserved future use) registered and unbuffered DIMM types (left middle and right position respectively). The second notch is the voltage key position which represents 5.0 V 3.3 V and RFU DIMM …

A SO-DIMM SODIMM or small outline dual in-line memory module is a type of computer memory built using integrated circuits.SO-DIMMs are a smaller alternative to a DIMM being roughly half the size of regular DIMMs.. SO-DIMMs are often used in …

Registered memory – Wikipedia

Memory module – Wikipedia

Memory module – Wikipedia

Motherboard – Wikipedia

On the left side there may be a write-protection notch. If the notch is omitted the card can be read and written. If the card is notched it is read-only. If the card has a notch and a sliding tab which covers the notch the user can slide the tab upward (toward the contacts) to declare the card read/write or downward to declare it read-only.

The notch on DDR2 DIMMs is in a different position from DDR DIMMs and the pin density is higher than DDR DIMMs in desktops. DDR2 is a 240-pin module DDR is a 184-pin module . Notebooks have 200-pin SO-DIMMs for DDR and DDR2; however the notch on DDR2 modules is in a slightly different position than on DDR modules.

In computing a memory module or RAM (random-access memory ) stick is a printed circuit board on which memory integrated circuits are mounted. Memory modules permit easy installation and replace…

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