The Crucial company has developed a 4GB DDR2666-128 LRDIMM module, with a high density and that has been developed for servers that require a large amount of RAM memory.
Crucial has announced the RAM modules developed for servers, these being the fastest and highest density to date. These Crucial modules are DDR4-2666 LRDIMMs, which are 128GB in size, which are compatible with the latest servers. These drives are compatible with systems based on Intel Xeon processors and AMD EPYC processors. The company further guarantees that these modules are compatible with Intel's scalable Xeon processors based on the Skylake-SP architecture, which hit the market this year and target systems where RAM is critically important.
These modules are very complex, due to the LRDIMM systems and also have a super dense memory position, something that makes the price extremely high. These memories make use of the 2666MT / s interface working at 12V and a CL22 latency. The modules are based on Micron's 8GB DRAM ICs, which are manufactured in 20nm, being assembled into 4Hi sets using TSV. The system makes use of 36 modules in integrated circuits. This layout makes the module organization highly complex, being an octal LRDIMM system classified into two physical ranges and four logical ranges.
It is a challenge that these modules work at 2666MT / s, something that causes these modules to have higher latencies than those given by JEDEC, which for DDR4-2666 is CL17-CL20. The problem is that the benefits are diminished with high frequencies, something that is necessary to keep it stable. Something very important is the density of 128GB. If we see it with the scalable dual socket Xeon processors with a suffix -M, which supports twelve sockets for RAM, it makes us go from 768GB to 1.TB of RAM and this will be possible thanks to the 128GB LRDIMM modules, something that will not be possible with 64GB modules. For DRAM-dependent applications such as large databases, keeping all memory is the most important for performance.
The memories developed by Crucial have 34 stages with more than 100 tests and verifications, something that makes them very expensive to manufacture. These 4Gb Crucial DDR2666-128 modules are priced at $ 3.999 per module, which is very expensive, but we do have to factor in feature rates, quantity, and support. Obviously these modules have not been developed for domestic solutions and for servers this can be useful and important.
Source: AnandTech
