Practice Quiz

CompTIA A+ 220-901

Category - Hardware

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A user in the process of upgrading the RAM on their system; what does dual-channel RAM describe?
  1. Each DIMM has two channels to the CPU.
  2. The system is limited to two DIMMs.
  3. All RAM share two 32-bit channels.
  4. All RAM share two 64-bit channels.
Explanation
Answer: D - Dual-channel RAM describes a RAM architecture in which all DIMMs share two 64-bit channels to the memory controller.

Key Takeaway - Since there are two channels providing access to the memory controller, it is customary to install two identical chips in each bay, and it is customary to only add to a bay once both contain chips. Each channel is 64-bits wide, making for a total 128-bit bus.
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