Server memory modules

GOODRAM brand memory, intended for workstations and servers, is a solution fulfilling the requirements of equipment whose operational stability is one of the key elements.

Available server memory

Due to construction and specific functions and types of application, we can distinguish:

  • ECC memory
  • RDIMM memory
  • FBDIMM memory
  • LRDIMM memory

ECC memory

What is ECC memory and what is the difference between standard RAM and ECC?

Apparently, besides the number of chips installed in the memory module, there is no difference between the ECC memory and DRAM. Moreover, construction of this type of memory allows to use the same type of connector used to install RAM in the motherboard. Lack of clear external differences is only apparent. While standard DDR, DDR2 and DDR3 memory modules are equipped with (or handled by) a data bus with the width of 64Bits, the data bus of ECC memory is extended with additional 8 bits giving all together 72 bits. The additional 8 bits of ECC memory data bus is used to send control information, whose task is correction of 1bit errors and detection of 2bit errors. The remaining bits allow to store information necessary during error detection and correction.

What is the role of the ECC function?

Every Random Access Memory (RAM) is responsible for the process of storing temporary data necessary for operation of individual applications. During the process of information exchange, RAM is exposed to errors caused by interference in operation that can lead to data loss or system instability. Additional security measure in the form of Error Correction Code (ECC) function was introduced exactly in order to detect and eliminate errors.

What is the application of ECC memory?

System stability and operational safety offered by memory with ECC function has a special importance for workstation group computers and servers. The error correction function is not reserved only to server solutions and proves well in the case of standard motherboards with AMD chipset. It worth noticing that the ECC function has no influence on the operating speed /parameters of RAM. Further advantages of ECC memory include stable operation, data patrolling mechanism, and thanks to application of selected chips – top manufacturing quality.

RDIMM memory

RDIMM (Registered DIMM or ECC REG) is a memory module, which, besides ECC mechanism, has additionally a built-in register. It is used for strengthening signal at system bus between DRAM modules and the memory controller. The register function allows stable system operation with a greater number of modules than usually applied. The architecture of RDIMM differs from standard PC memory. They are intended for systems, where amount of memory and its stability have key importance. The majority of platforms is compatible with both ECC and ECC REG memory, although the two types cannot be mixed together. Moreover, computers use/handle greater volumes of RDIMM than ECC UDIMM.

FBDIMM memory

FBDIMM (Full Buffered) is the type of memory available only in DDR2 technology. The memory has a built-in memory controller called Advanced Memory Buffer (AMB). Thanks to application of serial communication, the controller reduces load of data bus and address bus. In this architecture data are stored in the module via ABM. Motherboards for FBDIMM solutions are designed in a different way than the ones based on ECC REG memory. That is why, it is not possible to use two different types of memory in one motherboard. As a result of intensive operation of the controller, FBDIMM dissipates much heat and hence radiators are required for this memory. Due to its construction, they must be installed in pairs.

LRDIMM memory

LRDIMM modules (Load Reduced DIMM) is a new type of memory, which is a continuation of FBDIMM modules and LRDIMM/RDIMM memory can be used in the same platforms However, servers can accommodate more LRDIMM than RDIMM memory. Currently, greater single capacities of LRDIMM  than RDIMM are available (64GB as compared with 32GB) and with a full computer load, LRDIMM memory can operate at higher clock rates than RDIMM. For example, in the case of dual processor motherboards, it is possible to use as much as 384GB of LRDIMM and only 192GB of DIMM.
Please try our  memory configurator. Select the solution you’re looking for in a fast and simple way!

GOODRAM memory modules decoder

W-MEM 1333 R 3 D 4 K2 4G S M L LV B
number of ranks
chips manufacturer
heat spreader
  1. Prefix:
    • W-MEM – proprietary,
    • W-IN –industrial,
    • W-IT – industrial extended temperature. (-40 ~ +85°C).
  2. Speed:
    • 26 – 266 MHz,
    • 33 – 333 MHz,
    • 40 – 400 MHz,
    • 53 – 533 MHz,
    • 67 – 667 MHz,
    • 80 – 800 MHz,
    • 1066 – 1066 MHz,
    • 1333/13 – 1333 MHz
    • 1600/16 – 1600 MHz,
    • 1866 /18– 1866 MHz.
  3. Type:
    • S – SODIMM,
    • D – DIMM,
    • E – ECC,
    • R – ECC REG,
    • F – FBDIMM,
    • L – LRDIMM,
    • SE – SODIMM ECC.
  4. Generation
    • none – DDR1,
    • 2 – DDR2,
    • 3 – DDR3,
    • 4 – DDR4.
  5. Ranks:
    • S – 1 rank,
    • D – 2 ranks
    • Q – 4 ranks
    • O – 8 ranks
  6. Organisation
    • 4 – x4,
    • 8 – x8,
    • 16 – x16.
  7. Number of memory modules
    • none– 1 module
    • K2 – 2 module
    • K3 – 3 module
    • K4 – 4 module
  8. Capacity:
    • in GB, if none G = MB.
  9. Additional
    • for mamory UDIMM: S –Single Rank.
  10. Chips manufacturer:
    • M – Micron,
    • H – Hynix,
    • G – Samsung,
    • E – Elpida,
    • N – Nanya.
  11. Profile:
    • none – low profile,
    • L – very low profile.
  12. Voltage:
    • None – standart voltage (ex.: DDR3 – 1,5 V),
    • LV – low voltage(ex.: DDR3 – 1,35 V).
  13. Heat spreader:
    • None – without heat spreader
    • B – heat spreader

* Optional parameters which do not need to be present in the P / N are selected with bold italic

* Recommended memory models may vary depending on the type of individual configurations (processor type etc.)