SAMSUNG 16GB DDR4-2666 ECC RDIMM Server Memory

It is a Registered DIMM (RDIMM) with ECC. A register on the module buffers command and address signals between the memory controller and the DRAM chips. RDIMMs are designed for servers and some workstations; they will not work in standard desktop motherboards that only accept unbuffered non-ECC DIMMs, and they should not be mixed with unbuffered modules in the same system.

2Rx4 means the module is dual rank and built from DRAM chips with a 4-bit wide data interface. Dual rank lets the memory controller alternate between two sets of chips for better parallelism. The x4 organisation is favoured in servers because it supports advanced error correction modes such as SDDC or chipkill on platforms that offer them, improving tolerance to a failing DRAM device.

DDR4-2666 registered ECC DIMMs in 2Rx4 configuration are a standard memory type for Dell PowerEdge 14th generation servers such as the R740 and HPE ProLiant Gen10 servers such as the DL380 Gen10. As always, check your server's memory population guidelines and keep the module type consistent with the DIMMs already installed for the best results.

RDIMMs and LRDIMMs cannot be mixed in the same server; the platform will typically refuse to boot or flag a configuration error. Mixing DDR4 RDIMMs of different speeds is generally possible, but all memory will run at the speed of the slowest module or the processor's supported maximum. Matching capacity, rank and speed across channels gives the most predictable performance.

The module is rated at 2666 MT/s, so in a system that supports DDR4-2933, such as one with second-generation Xeon Scalable processors, it will run at up to 2666 MT/s. If faster modules are installed alongside it, the memory bus will generally drop to 2666 MT/s for all DIMMs. Actual speed can also be lowered by the number of DIMMs per channel.

Xeon E5 v3 and v4 platforms use DDR4 RDIMMs, and a DDR4-2666 module will typically operate at the platform's lower supported speed, such as 2133 or 2400 MT/s. However, server vendors validate memory per generation, so confirm the module type and rank configuration against your system's documentation before purchasing for an older server.

Like all standard DDR4 modules, this Samsung RDIMM operates at 1.2V. That is lower than the 1.5V or 1.35V used by DDR3 server memory, which helps reduce power consumption and heat in servers populated with many DIMMs. DDR4 is physically keyed differently from DDR3, so it cannot be installed in DDR3 slots.

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