NOTE: x4 and x8 DRAM based DIMMs can be mixed providing support for RAS features. However, all guidelines for specific RAS features must be followed. x4 DRAM based DIMMs retain Single Device Data Correction (SDDC) in memory optimized (independent channel) mode. x8 DRAM based DIMMs require Advanced ECC mode to gain SDDC.

The following sections provide additional slot population guidelines for each mode.

Advanced ECC (Lockstep)

Advanced ECC mode extends SDDC from x4 DRAM based DIMMs to both x4 and x8 DRAMs. This protects against single DRAM chip failures during normal operation.

Memory installation guidelines:

•Memory modules must be identical in size, speed, and technology.

•DIMMs installed in memory sockets with white release tabs must be identical and similar rule applies for sockets with black and green release tabs. This ensures that identical DIMMs are installed in matched pairs - for example, A1 with A2, A3 with A4, A5 with A6, and so on.

NOTE: Advanced ECC with mirroring is not supported.

Memory Optimized (Independent Channel) Mode

This mode supports SDDC only for memory modules that use x4 device width and does not impose any specific slot population requirements.

Memory Sparing

NOTE: To use memory sparing, this feature must be enabled in the System Setup.

In this mode, one rank per channel is reserved as a spare. If persistent correctable errors are detected on a rank, the data from this rank is copied to the spare rank and the failed rank is disabled.

With memory sparing enabled, the system memory available to the operating system is reduced by one rank per channel. For example, in a dual-processor configuration with sixteen 4 GB dual-rank DIMMs, the available system memory is: 3/4 (ranks/channel) × 16 (DIMMs) × 4 GB = 48 GB, and not 16 (DIMMs) × 4 GB = 64 GB.

NOTE: Memory sparing does not offer protection against a multi-bit uncorrectable error.

NOTE: Both Advanced ECC/Lockstep and Optimizer modes support Memory Sparing.

Memory Mirroring

Memory Mirroring offers the strongest DIMM reliability mode compared to all other modes, providing improved uncorrectable multi-bit failure protection. In a mirrored configuration, the total available system memory is one half of the total installed physical memory. Half of the installed memory is used to mirror the active DIMMs. In the event of an uncorrectable error, the system will switch over to the mirrored copy. This ensures SDDC and multi-bit protection.

Memory installation guidelines:

•Memory modules must be identical in size, speed, and technology.

•DIMMs installed in memory sockets with white release tabs must be identical and similar rule applies for sockets with black and green release tabs. This ensures that identical DIMMs are installed in matched pairs - for example, A1 with A2, A3 with A4, A5 with A6, and so on.

Sample Memory Configurations

The following tables show sample memory configurations that follow the appropriate memory guidelines stated in this section.

NOTE: 16 GB quad-rank RDIMMs are not supported.

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Dell M620 owner manual Sample Memory Configurations, Advanced ECC Lockstep
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M620 specifications

The Dell M620 is a high-performance blade server designed to deliver exceptional computing power and efficiency for enterprise applications. As part of the Dell PowerEdge M-Series lineup, the M620 is known for its flexibility, scalability, and robust feature set, making it an ideal choice for data centers looking to optimize their server infrastructure.

One of the main features of the Dell M620 is its advanced processing capabilities. It supports dual Intel Xeon E5-2600 series processors, which enable users to take advantage of the latest multi-core technology to handle demanding workloads. With support for up to 768 GB of RAM, the M620 ensures efficient memory allocation for resource-intensive applications, enhancing overall performance.

The blade server boasts a modular design that allows it to fit seamlessly into the Dell PowerEdge M1000e chassis, which can house multiple blade servers. This design not only saves physical space but also optimizes power and cooling resources, significantly reducing total cost of ownership. The M620's thermal efficiency is further enhanced by its intelligent fan control, which adjusts airflow based on workload requirements, ensuring optimal operating conditions.

In terms of storage, the Dell M620 offers flexibility with support for up to two hot-swappable hard drives. This feature facilitates easy upgrades and maintenance, allowing organizations to manage data growth efficiently. The server also supports the latest RAID technology, which provides data redundancy and enhances reliability, essential for critical business operations.

Networking capabilities are another standout feature of the M620. It provides multiple options for integrated networking, including support for up to four 1Gb Ethernet ports or 10Gb Ethernet options. This enables fast and reliable connectivity, which is crucial for data-intensive applications and virtualization environments.

Security is also a key consideration in the design of the Dell M620. It comes equipped with various security features, including Trusted Platform Module (TPM), secure BIOS, and systems management tools, ensuring a secure computing environment.

Overall, the Dell M620 blade server combines powerful processing capabilities, expandable memory, efficient design, versatile storage options, and robust networking solutions. These characteristics make it a compelling choice for organizations seeking to enhance their IT infrastructure, drive innovation, and meet the challenges of today’s digital landscape. With Dell's commitment to quality and performance, the M620 continues to be a valuable solution for enterprise customers.
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