Dell EMC PowerEdge offers a variety of memory options to meet your workloads requirements. Memory plays a key role in your overall performance along with your processor, accelerator and storage choices.
Properly configuring a server with balanced memory is critical to ensure memory bandwidth is maximized and latency is minimized. When server memory is configured incorrectly, unwanted variables are introduced into the memory controllers’ algorithm, which inadvertently slows down overall system performance. To mitigate this risk of reducing or even bottlenecking system performance, it is important to understand what constitutes balanced, near balanced and unbalanced memory configurations. Variables such as DIMM consistency and slot population will dictate whether a configuration is balanced or unbalanced. Follow these guidelines at the socket and server level, to achieve a balanced memory configuration:
Use 6 or 12 DIMMS per 2nd Generation Intel® Xeon® Scalable CPU for a balanced configuration. Use 8 or 16 DIMMs per 2nd Generation AMD EPYC™ CPU for a balanced configuration.
Use identical DIMMs (same capacity, rank and DIMM type)
Use the same memory configurations for every CPU in the server.
Intel® Optane™ Persistent Memory delivers a unique combination of an affordable large-capacity memory tier, with data persistence. Ideal for virtualization, databases and other demanding workloads.
For situations that demand mixing DIMM sizes, all memory should be chosen based on identical rank structure, and all memory channels should be populated with an identical mix of DIMM types (ie RDIMMs cannot be mixed with LRDIMMs).
Choose the appropriate processor to support the expected memory frequency.
A DIMM — or dual in-line memory module — is a series of random access memory chips mounted on a small circuit board. DIMMs are installed in sockets on your computer's motherboard.
Registered DIMM Provides for higher capacity options and advanced RAS features. It is the most commonly used DIMM type, and offers the best mix of frequency, capacity, and rank structure choices
Load Reduced DIMM Provides maximum capacity beyond that of an RDIMM but at a higher power consumption. Uses a buffer to reduce memory loading to a single load on all DDR signals, allowing for greater capacity.
Unregistered or Unbuffered DIMM Provides low latency and low density. Used on single socket servers in the PowerEdge portfolio.
Intel® Optane™ Persistent MemoryProvides a large memory capacity at an affordable price. Any application can take advantage of DCPMM in Memory Mode with a compatible operating system. Unlock more performance as well as persistency when using an application that supports App Direct Mode. DCPMM is used in conjunction with RDIMMs or LRDIMMs and a maximum number of 6 DCPMMs can be used per CPU.
Non-Volatile DIMM Provides a persistent memory solution with NAND and DRAM that maintains data in power loss, system crash, or normal shutdown. This solution requires a battery as a power source for an AC loss condition. It can be used in conjunction with RDIMMs.
Dell EMC PowerEdge integrates the Intel® Optane™ Persistent Memory Module to bridge functionality between traditional memory and storage. The advancement of memory capability is critical to accommodate growing customer needs. Data center utilization is not possible if memory bandwidth or capacity is bottlenecking system performance. Dell EMC PowerEdge servers configured with Intel® Optane™ Persistent Memory Modules focus on enabling the future of data center technology. Latency reduction is achieved by enabling core application data to be stored as non-volatile information; providing bandwidth support for large in-memory databases such as Microsoft SQL Server 2019. Furthermore, the substantial increase in memory capacity provides more resources to be used in large storage capacity environments such as VM scaling.
Intel® Optane™ Persistent Memory2nd Generation AMD EPYC™ Processors: Balanced Memory Reference Guide
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