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Server UDIMM, LRDIMM, RDIMM what is the difference between the three kinds of memory, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain in detail for you, people with this need can come to learn, I hope you can gain something.

UDIMM

UDIMM: full name Unbuffered DIMM, that is, unbuffered dual inline memory module, refers to the address and control signal without buffer, without any timing adjustment, directly to the DRAM chip on the DIMM. UDIMM has less latency at the same frequency because there is no cache between CPU and memory.

When data is transferred from CPU to each memory particle, the UDIMM needs to ensure that the transmission distance between the CPU and each memory particle is equal, so that parallel transmission is effective, which requires a higher manufacturing process, so the UDIMM is low in capacity and frequency.

RDIMM

RDIMM: full name Registered DIMM, dual inline memory module with registers. RDIMM adds a register to the memory bar for transmission, which is located between CPU and memory particles, which not only reduces the distance of parallel transmission, but also ensures the effectiveness of parallel transmission. Because of the high efficiency of registers, it is easier to improve the capacity and frequency of UDIMM,RDIMM.

LRDIMM

LRDIMM: full name Load Reduced DIMM, low-load dual inline memory module. Compared with RDIMM,LRDIMM, it does not use complex registers, but simply buffers. Buffering reduces the power load on the lower motherboard, but has almost no impact on memory performance.

In addition, LRDIMM memory changes the Register chip on RDIMM memory to iMB (isolation Memory Buffer) memory isolation buffer chip, which has the direct benefit of reducing the memory bus load and further increasing the memory support capacity.

Difference and application

Because UDIMM does not use registers, it does not need buffering, and the delay is small at the same frequency. In addition, another advantage of UDIMM is its low price. The disadvantage is that the capacity and frequency are low. The capacity * * supports 4GB and the frequency * * supports 2133 MT/s. In addition, because UDIMM can only work in Unbuffered mode, it does not support the full allocation of server memory (* capacity), and cannot achieve server performance to a certain extent. In the application scenario, UDIMM can be used not only in the server field, but also in the desktop market.

RDIMM supports Buffered mode and high-performance Registered mode, which is more stable than UDIMM, and supports server memory capacity. In addition, RDIMM supports higher capacity and frequency, capacity supports 32GB, and frequency supports 3200 MT/s. The disadvantage is that due to the use of registers, the delay is higher, and the energy consumption is increased. in addition, the price is higher than that of UDIMM. Therefore, RDIMM is mainly used in the server market.

LRDIMM can be said to be a substitute for RDIMM. On the one hand, it reduces the load and power consumption of the memory bus, and on the other hand, it provides the supporting capacity of memory. Although its frequency is the same as RDIMM, it is 3200 MT/s, but it is increased to 64GB in capacity. And it consumes only 50% of its memory compared to RDIMM,Dual-Rank LRDIMM. LRDIMM is also shipped in servers, but it is also more expensive than RDIMM.

In order to more intuitively understand the difference between the three, the author makes a simple comparison at the end of the article.

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