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Difficulty: MediumRAM Types and Characteristics

A system administrator is reviewing memory specifications for upcoming hardware deployments across desktop workstations, mobile devices, and enterprise servers. Match each RAM specification or module type to its corresponding technical description.

  • DDR4 SO-DIMM260-pin small-outline memory module designed for space-constrained laptop and compact desktop motherboards.
  • DDR5 UDIMMUnbuffered desktop memory module featuring an onboard PMIC and internal dual 32-bit subchannels.
  • Sideband ECC UDIMMUnbuffered memory module utilizing an expanded 72-bit bus width to detect and correct single-bit memory errors.
  • Registered DIMM (RDIMM)Enterprise memory module equipped with an inline register to reduce command and address bus loading on the memory controller.

Answer

DDR4 SO-DIMM matches the 260-pin small-outline module description; DDR5 UDIMM matches the module featuring an onboard PMIC and internal dual 32-bit subchannels; Sideband ECC UDIMM matches the module utilizing an expanded 72-bit bus width for error correction; and Registered DIMM (RDIMM) matches the enterprise module equipped with an inline register to reduce memory controller loading.
Each RAM specification is accurately matched based on its distinct pin count, electrical power architecture, error correction bus width, or server signal buffering capabilities.

Step-by-Step Solution

1
Analyze mobile and compact form factor characteristics.
Identified DDR4 SO-DIMM as the 260-pin small-outline memory module.
SO-DIMMs are physically smaller than standard DIMMs and DDR4 variants specifically feature 260 pins.
2
Evaluate memory generation innovations regarding power and channels.
Matched DDR5 UDIMM to the onboard PMIC and dual 32-bit subchannel design.
DDR5 shifts power management from the motherboard to an on-module PMIC and introduces split 32-bit subchannels per stick.
3
Examine error-checking data bus implementations.
Matched Sideband ECC UDIMM to the 72-bit bus width specification.
Sideband ECC uses 8 parity/check bits alongside the 64-bit data bus (64 + 8 = 72 bits) to detect and correct single-bit errors.
4
Differentiate server buffering memory types from workstation memory.
Matched Registered DIMM (RDIMM) to the inline register functionality.
RDIMMs buffer control and address lines to diminish capacitive loading on the server's CPU memory controller.

Key Concept

RAM Form Factors, DDR Specifications, and Error-Correcting Architecture
Estimated Time:1m 30s
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Topics

RAM Types and Characteristics

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