Cache Memory Module for RAID Controllers | Specifications & Selection

Product Specifications

Technical details and manufacturing context for Cache Memory Module

Definition

The Cache Memory Module is a critical sub-component of a RAID (Redundant Array of Independent Disks) controller. It functions as a high-speed buffer, holding data that is likely to be requested by the host system or data waiting to be written to the disk array. This significantly reduces latency and improves overall storage system performance by minimizing the need for direct, slower access to the physical hard drives or SSDs. The module is typically installed on the RAID controller board and communicates with the controller's processor and disk interface. It uses volatile memory such as DRAM, which requires power to retain data. To protect cached data during power loss, the module may be paired with a battery backup unit (BBU) or flash-based backup. The module's capacity, memory type, and data transfer rate are key parameters that influence RAID performance. For example, capacities range from 512 MB to 4096 MB, and memory types include DDR4 and DDR5, with data transfer rates from 3200 to 4800 MT/s. The module operates within a temperature range of 0°C to 70°C, and storage temperature ranges from -40°C to 85°C. Operating voltage is typically 1.2V to 1.35V, and power consumption is between 3W and 8W. Form factors include DIMM and SO-DIMM, and error correction may be ECC or non-ECC. The module is designed for use in enterprise storage systems where data integrity and performance are critical. When selecting a cache memory module, it is essential to verify compatibility with the specific RAID controller model, as well as the required capacity, memory type, and error correction capability. Always consult the manufacturer's documentation to confirm that the module meets the system's requirements and standards, such as JEDEC specifications for memory and data transfer rates.

Working Principle

The module operates by intercepting data requests between the host system and the disk array. For read operations, it stores copies of recently read data; subsequent requests for the same data are served directly from the fast cache memory. For write operations, it can acknowledge writes to the host once data is stored in the cache (write-back caching), allowing the controller to later optimize and schedule the physical write to the disks. It typically uses volatile memory (like DRAM) and may include a battery backup unit (BBU) or flash backup to protect cached data during power loss.

Common Materials

DRAM (Dynamic Random-Access Memory) integrated circuits, Printed Circuit Board (PCB), Electronic connectors

Technical Parameters

Parameter	Typical range	Notes & selection driver
Capacity	512–4096 MB	Determines cache size for RAID performance
Cache Type	DDR4–DDR5	Memory technology generationJEDEC
Data Transfer Rate	3200–4800 MT/s	Higher rate improves throughputJEDEC
Operating Temperature	0–70 °C	Above 70°C may cause data loss
Storage Temperature	-40–85 °C	Non-operational limits
Operating Voltage	1.2–1.35 V	DDR4/DDR5 voltage rangeJEDEC
Power Consumption	3–8 W	Affects system cooling requirements
Form Factor	DIMM–SO-DIMM	Compatibility with controller boardJEDEC
Error Correction	ECC–Non-ECC	ECC required for data integrity
Relative Humidity	10–90 %	Non-condensing
Weight	10–30 g	Varies with capacity and form factor

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

DRAM Chips Part
Provide the volatile memory cells for data storage.

Material: Semiconductor (Silicon)
PCB (Motherboard)
Provides the electrical pathways and physical mounting for all electronic components.

Material: Fiberglass-reinforced epoxy laminate (e.g., FR-4)
Edge Connector Part
Enables electrical connection and communication with the RAID controller's main board.

Material: Copper alloy, gold plating
Battery Backup Unit Optional
Keeps the cache alive through a power cut so write-back data is not lost.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

RAID Controller

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Storage Controller

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Algorithm Engine

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Manufacturers of Cache Memory Module

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Frequently Asked Questions

What is the typical capacity range for a cache memory module?

According to the directory reference, the capacity ranges from 512 MB to 4096 MB. However, the exact capacity required depends on the RAID controller model and the performance needs of the storage system. Always verify the supported capacity with the controller's documentation.

What memory types are available for cache memory modules?

The directory lists DDR4 and DDR5 as possible memory types, with data transfer rates from 3200 to 4800 MT/s. These are JEDEC standards. Confirm the memory type and speed supported by your RAID controller before purchasing.

What are the operating temperature limits for these modules?

The operating temperature range is 0°C to 70°C. Exceeding 70°C may cause data loss. The storage temperature range is -40°C to 85°C. Ensure adequate cooling in the system to stay within these limits.

Do cache memory modules support error correction?

The directory indicates that error correction can be ECC or non-ECC. ECC is required for data integrity in many enterprise applications. Check the RAID controller's requirements to determine if ECC is necessary.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	N/A (solid-state component)
other spec:	Humidity: 5% to 95% non-condensing, Vibration: 2.17G RMS (5-500Hz), Shock: 20G (11ms half-sine)
temperature:	0°C to 70°C (operational), -40°C to 85°C (storage)

Cache Memory Module

Product Specifications

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Frequently Asked Questions

What is the typical capacity range for a cache memory module?

What memory types are available for cache memory modules?

What are the operating temperature limits for these modules?

Do cache memory modules support error correction?

Data Basis

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