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Difficulty: MediumRAM Types and Characteristics

A technician is upgrading a desktop computer system to a modern platform that specifies DDR5 SDRAM support. The client requests to reuse high-performance DDR4 RAM modules from their previous system to save costs. Upon inspecting the new motherboard memory slots, which of the following explains why the DDR4 memory modules cannot be physically installed?

  1. DDR5 DIMMs feature a different notch position along the pin contacts to prevent accidental insertion of incompatible DDR4 modules.Answer
  2. B
    DDR4 desktop modules utilize a 260-pin SO-DIMM form factor, which is physically smaller than the 288-pin DDR5 desktop slots.
  3. C
    DDR4 modules require installation into adjacent motherboard slots to close the circuit, whereas DDR5 modules require alternating slots.
  4. D
    DDR4 modules use a 184-pin keying layout designed exclusively for legacy PCIe slot architectures.

Answer

DDR5 DIMMs feature a different notch position along the pin contacts to prevent accidental insertion of incompatible DDR4 modules.
Although both desktop DDR4 and DDR5 memory modules (DIMMs) feature 288 contact pins, the mechanical alignment notch on the bottom edge of the module is shifted to a different position for DDR5. This keying mechanism ensures that older 1.2V DDR4 modules cannot be physically inserted into 1.1V DDR5 slots, preventing damage to the hardware.

Step-by-Step Solution

1
Analyze the physical RAM module standards and motherboard compatibility.
DDR4 and DDR5 desktop memory modules both have 288 pins, but they operate at different voltages (1.2V for DDR4 vs 1.1V for DDR5) and use different pin layout architectures.
Installing incompatible memory can cause electrical damage to the motherboard and RAM.
2
Identify the key physical mechanism preventing wrong module insertion.
Manufacturers shift the location of the mechanical key notch on the bottom pin connector between RAM generations.
The altered notch position physically blocks a DDR4 module from fitting into a DDR5 motherboard slot.

Key Concept

RAM Keying and Form Factor Compatibility
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Topics

RAM Types and Characteristics

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