•In a dual-processor configuration, the memory configuration for each processor should be identical. For example, if you populate socket A1 for processor 1, then populate socket B1 for processor 2, and so on.

•Memory modules of different sizes can be mixed provided that other memory population rules are followed (for example, 2 GB and 4 GB memory modules can be mixed).

•Populate four DIMMs per processor (one DIMM per channel) at a time to maximize performance.

•If memory modules with different speeds are installed, they will operate at the speed of the slowest installed memory module(s) or slower depending on system DIMM configuration.

Mode-Specific Guidelines

Four memory channels are allocated to each processor. The allowable configurations depend on the memory mode selected.

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:

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Dell T620 owner manual Mode-Specific Guidelines, Advanced ECC Lockstep
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T620 specifications

The Dell PowerEdge T620 is a versatile and powerful tower server designed to meet the demands of growing businesses and organizations. Launched as part of Dell’s 12th generation of PowerEdge servers, the T620 combines cutting-edge features, advanced technologies, and robust performance capabilities.

At its core, the T620 supports Intel's Xeon E5-2600 processors, providing exceptional computational power and efficiency. Organizations can choose from a range of CPUs, allowing them to customize their server according to specific workload requirements. The server can accommodate up to two processors, offering a substantial number of cores for multitasking and demanding applications.

One of the standout features of the T620 is its support for a significant amount of memory. It can house up to 768GB of DDR3 RAM across 24 DIMM slots. This ample memory capacity ensures that the server can handle memory-intensive applications with ease, making it suitable for virtualization, database management, and other critical tasks.

The T620 is equipped with several storage options, supporting up to sixteen 2.5-inch or eight 3.5-inch hard drives. This flexibility allows for high storage density and scalability, accommodating various storage configurations depending on the user’s needs. The system also supports both traditional SATA and high-speed SAS drives, making it adaptable for performance or capacity-driven environments.

Networking capabilities in the T620 are advanced, featuring embedded dual Gigabit Ethernet ports for reliable connectivity. This server supports multiple RAID configurations, enhancing data redundancy and performance. Additionally, the inclusion of Dell's iDRAC (Integrated Dell Remote Access Controller) ensures remote management and monitoring capabilities, allowing administrators to operate the server efficiently without being on-site.

The design of the T620 is built with expandability in mind. Its chassis offers flexibility for adding additional components, such as graphics cards and expansion cards, providing ample room for growth as organizational needs evolve.

In summary, the Dell PowerEdge T620 is a robust and flexible tower server that caters to the diverse needs of businesses. Its powerful processors, extensive memory options, versatile storage configurations, and advanced management features make it a reliable choice for companies seeking to enhance their IT infrastructure. The T620 stands out as a solid option for those looking to leverage technology for business success and growth.
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