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Dell R420, E18S001 General Memory Module Installation Guidelines, Mode-Specific Guidelines

Models: E18S E18S001 R420

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General Memory Module Installation Guidelines

This system supports Flexible Memory Configuration, enabling the system to be configured and run in any valid chipset architectural configuration. The following are the recommended guidelines for best performance:

•UDIMMs and RDIMMs must not be mixed.

•x4 and x8 DRAM based DIMMs can be mixed. For more information, see Mode-Specific Guidelines.

•A maximum of two UDIMMs can be populated in a channel.

•A maximum of two quad-rank RDIMMs can be populated in a channel.

•A maximum of two single- or dual-rank RDIMMs can be populated in a channel.

•One quad-rank RDIMM and one single- or dual-rank RDIMM can be populated per channel.

•Populate DIMM sockets only if a processor is installed. For single-processor systems, sockets A1 to A6 are available. For dual-processor systems, sockets A1 to A6 and sockets B1 to B6 are available.

•Populate all sockets with white release tabs first and then black.

•Populate the sockets by highest rank count in the following order - first in sockets with white release levers and then black. For example, if you want to mix quad-rank and dual-rank DIMMs, populate quad-rank DIMMs in the sockets with white release tabs and dual-rank DIMMs in the sockets with black release tabs.

•In a dual-processor configuration, the memory configuration for each processor must 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).

•Depending on mode-specific guidelines, populate two or three DIMMs per processor (one DIMM per channel) at a time to maximize performance. For more information, see Mode-Specific Guidelines.

•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

Three 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 (Reliability, Availability, and Serviceability) RAS features. However, all guidelines for specific RAS features must be followed. x4 DRAM based DIMMs retain Single Device Data Correction (SDDC) in either memory optimized (independent channel) or Advanced ECC modes. 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 sockets A1, A4, B1, and B4 are disabled and do not supported Advanced ECC mode.

•DIMMs must be installed in matched pairs — DIMMs installed in memory sockets (A2, B2) must match DIMMs installed in memory sockets (A3, B3) and DIMMs installed in memory sockets (A5, B5) must match DIMMs installed in memory sockets (A6, B6).

NOTE: Advanced ECC with mirroring is not supported.

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Dell R420, E18S001 owner manual General Memory Module Installation Guidelines, Mode-Specific Guidelines
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E18S, E18S001, R420 specifications

The Dell E18S001, E18S, and R420 are notable products within Dell's extensive portfolio, catering to diverse computing needs, ranging from high-performance business applications to gaming and creative workloads.

The Dell E18S001 is designed with portability in mind, making it an ideal choice for professionals who need to work on-the-go. It boasts a sleek design with a lightweight frame, making it easy to transport. Powered by the latest Intel processors, the E18S001 offers exceptional performance for multitasking and running resource-intensive applications. With a vibrant display, users enjoy sharp graphics and vivid colors, perfect for graphic design or media consumption. Furthermore, it supports ample RAM and storage options, ensuring users can store important files and run multiple applications smoothly.

The E18S model focuses on delivering a balanced performance, supporting both business and everyday tasks. It features a durable build that can withstand daily wear and tear, making it suitable for office environments. This model is equipped with advanced connectivity options, including USB-C and HDMI ports, enabling seamless integration with various peripherals. Enhanced security features, such as a fingerprint reader, ensure that sensitive information remains protected, making it an attractive choice for corporate users.

On the other hand, the Dell R420 is a powerful server designed for enterprise-level performance. It is compatible with the Intel Xeon processor family, which is known for its reliability and efficiency. The R420 supports a high capacity of memory and offers flexible storage configurations to meet the demands of virtualized workloads and data-intensive applications. It also incorporates advanced management tools, allowing IT administrators to monitor and manage the system effectively. With its energy-efficient design, the R420 helps reduce operational costs while maintaining powerful performance.

Across these products, Dell emphasizes reliability, innovation, and user-friendly features. Each model comes equipped with state-of-the-art thermal management systems to ensure optimal performance and longevity. Additionally, Dell’s commitment to customer service and extensive warranty options further enhance the value of their products. From dynamic workstation needs to robust server requirements, the Dell E18S001, E18S, and R420 stand out as versatile solutions for a range of users.