In 2012, memory content on high-volume Intel and AMD processor based servers is exploding. Intel E5-2600 and AMD Opteron 6100/6200 processor based 2-way servers can generally support up to 24 memory sockets. New E5-4600 processer based servers have up to 48 memory sockets and the E7 servers up to 64 memory sockets. This memory expansion provides new and unmatched flexibility for server architects to configure servers with high memory content for demanding applications such as Performance Clouds, Virtualization and VDI, Big Data, In-Memory Databases such as SAP HANA, HPC and other memory-hungry applications that can take advantage of powerful multicore processors.
While Kingston’s 16GB Registered DIMMs are now becoming more common on higher-end servers, there is a new option to use Kingston 32GB memory modules that will be available in 2012 in two varieties – Registered DIMMs (RDIMMs), similar to modules that have been used in servers in the past, and Load Reduced DIMMs (LRDIMMs), which are newly supported technology on the Intel E5 and select AMD Opteron 6200 processor based platforms.
For more information about LRDIMMs, please consult our white papers.
Whether you need to use a 32GB RDIMM or LRDIMM will depend upon your requirements – just note that in a single server, RDIMMs and LRDIMMs cannot be mixed. You must configure each server exclusively with LRDIMMs or RDIMMs.
First of all, both the 32GB RDIMM and the 32GB LRDIMM are physically Quad Rank modules – the difference being that the LRDIMM technology uses on-module buffers to make the module appear to the memory controller as a Dual Rank module. This means that, on Intel E5 processor-based platforms, 32GB LRDIMMs can be used in all the available memory sockets whereas 32GB Quad Rank RDIMMs are limited to a maximum 2 DIMMs per Channel (2DPC) configurations as illustrated in the table below (which also shows the maximum memory speed supported in the different configurations):