A technician is upgrading the memory in a server. The server requires DDR3 Registered DIMMs. The server has four banks of three slots for memory and currently there is one 2GB module in each bank. When the technician attempts to add eight more 4GB modules of DDR3 unbuffered ECC memory, the memory does not fit in the slots. Which of the following is the cause of this issue?

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C. The server requires fully buffered memory. Registered DIMMs include a hardware register (buffer) between the memory controller and the DRAM chips, and server platforms that require registered DIMMs use slot signaling and physical configurations incompatible with unbuffered DIMMs. Because the technician brought unbuffered ECC modules instead of the required registered (buffered) type, the modules cannot seat or function in those slots - the buffering requirement is the root cause of the incompatibility.

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A. In a bank, 2GB and 4GB memory cannot be mixed. Mixing 2GB and 4GB modules is a capacity-mixing configuration concern, not a reason that modules physically fail to seat in the slots.

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B. The server cannot use ECC memory. The technician's chosen modules are in fact ECC memory, and registered DIMMs also commonly support ECC - ECC capability is separate from the buffering type requirement.

Answer

D. The total memory on the server cannot exceed 24GB of RAM. A 24GB total memory ceiling would prevent the system from recognizing additional capacity after that threshold, but would not cause modules to physically fail to fit in the slots.

A technician is upgrading the memory in a server. The server requires DDR3 Registered DIMMs. The server has four banks of three slots for memory and currently there is one 2GB module in each bank…

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