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Difficulty: HardRAM Types and Characteristics

A system technician is reviewing memory specifications for various desktop, laptop, and server deployments. Match each RAM type or architectural characteristic on the left with its corresponding operational description on the right.

  • DDR5 On-Die ECC (ODECC)Provides internal bit-error correction within the DRAM chips themselves, but does not protect data in transit across the bus to the CPU memory controller.
  • Registered Memory (RDIMM)Includes an onboard register chip to buffer command and address signals, reducing electrical load on the memory controller in high-density server configurations.
  • Dual-Channel DDR4 ArchitectureRequires populating matched memory modules across specific motherboard slots to combine two 64-bit channels into a 128-bit wide data path.
  • Small Outline DIMM (SODIMM)Uses a 260-pin physical form factor with lower voltage requirements, engineered specifically for notebook computers and small-form-factor systems.

Answer

DDR5 On-Die ECC matches internal bit-error correction within DRAM chips; Registered Memory matches using an onboard register chip to buffer signals for high-density servers; Dual-Channel DDR4 Architecture matches combining two 64-bit channels into a 128-bit wide data path; Small Outline DIMM matches the 260-pin form factor designed for notebooks and small systems.
Each memory specification correctly aligns with its architectural or physical attribute. DDR5 On-Die ECC handles error correction within the chip die itself; Registered Memory uses a register chip to lower memory controller signal strain; Dual-channel DDR4 links two 64-bit paths into a 128-bit channel; SODIMM represents the compact 260-pin module used in mobile systems.

Step-by-Step Solution

1
Analyze DDR5 On-Die ECC (ODECC)
Identify that ODECC corrects bit flips inside the memory die only, without performing side-band bus parity or ECC protection across the bus to the processor.
ODECC was introduced in DDR5 to manage smaller cell geometries, distinct from traditional side-band ECC.
2
Analyze Registered Memory (RDIMM)
Identify the presence of an onboard register (buffer) that holds memory addresses and commands before passing them to the DRAM chips.
Buffering reduces electrical load on the system memory controller, allowing support for higher RAM slot densities.
3
Analyze Dual-Channel DDR4 Architecture
Identify that installing matched DIMMs into designated color-coded slots enables throughput across two simultaneous 64-bit channels (128-bit total).
Multi-channel memory architectures increase total data bandwidth by doubling the bus width.
4
Analyze Small Outline DIMM (SODIMM)
Identify the standard laptop form factor, specifically the 260-pin count used for DDR4 SODIMM modules.
SODIMMs provide the smaller footprint required for space-constrained mobile devices.

Key Concept

RAM Form Factors, Pin Counts, Buffering, and Error Handling Characteristics
Estimated Time:1m 30s
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Topics

RAM Types and Characteristics

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