Desktop Boards
Desktop Boards
General memory information

Understanding bits and bytes
A bit is the smallest unit of memory storage and has the value of either 1 or 0 (one or zero). A byte is equal to 8 bits. See the following table for byte conversions.

Size Bytes KB MB GB
1 Kilobyte (KB) 1,024 -- -- --
1 Megabyte (MB) 1,048,576 1,024 -- --
1 Gigabyte (GB) 1,073,741,824 1,048,576 1,024 --
1 Terabyte (TB) 1,099,511,627,776 1,073,741,824 1,048,576 1,024

DIMMS and SO-DIMMS
Dual In-line Memory Module (DIMM) is the term for the memory modules supported by Intel® Desktop Boards. SO-DIMMs (Small Outline DIMMs) are the memory modules for Intel Desktop Boards in the mini-ITX form factor and for laptop computers.

Single- and multi-channel memory modes
Several types of memory modes can be configured on Intel Desktop Boards, depending on the number of memory modules installed. The memory mode is either single or one of the multi-channel modes (dual, triple, quad and flex).

  • Single-channel (or asymmetric) mode exists when one DIMM is installed or the memory capacities are unequal.
  • Dual-channel (or interleaved) mode is automatically enabled when the installed memory capacities of multiple DIMMs are equal.
  • All multi-channel memory modes increase the transfer speed of data between the DRAM and the memory controller by adding more channels of communication

See Single- and multi-channel memory modes for configuration details.


DDR, DDR2, and DDR3 memory

DDR stands for double data rate and is a type of memory where data is transferred on both the rising and falling edges of the clock signal. DDR2 and DDR3 are updates to the original DDR specification, improving the memory bus speeds.

DDR, DDR2 and DDR3 memory modules are mutually incompatible. You cannot install a DDR2 memory module in a board that was designed for DDR3. Voltages, pins and signaling differ between the memory types.

The key holes on these modules are positioned differently, see image. If you cannot get memory inserted, turn it 180 degrees and try again, or check to make sure you have the correct memory type for your desktop board.

The specification for DDR4 has been released by JEDEC (Joint Electron Devices Engineering Council), an independent engineering trade organization and standards body. DDR4 memory is expected to be available in 2014.

Desktop vs. server memory
The memory requirements for desktop computers and servers/workstations are different. Intel Desktop Boards require unbuffered memory. Servers require memory that provides more stability and reliability, and often use registered or buffered memory. Registered or buffered memory does not work in a board that is not designed for it, and vice-versa.

With registered or buffered memory, there is a register between the DRAM modules and the system memory controller. The register stores bits of information so that systems can write to, or read out, all the bits simultaneously. Fully Buffered DIMMs (FB-DIMMs), also used in server environments, include an advanced memory buffer between the memory controller and the memory module.

This applies to:

Intel® Desktop Board D2500CC
Intel® Desktop Board D2500HN
Intel® Desktop Board D2550DC2
Intel® Desktop Board D2550MUD2
Intel® Desktop Board D2700DC
Intel® Desktop Board D2700MUD
Intel® Desktop Board D410PT
Intel® Desktop Board D425KT
Intel® Desktop Board D510MO
Intel® Desktop Board D525MW
Intel® Desktop Board DB65AL
Intel® Desktop Board DB75EN
Intel® Desktop Board DH55HC
Intel® Desktop Board DH55PJ
Intel® Desktop Board DH55TC
Intel® Desktop Board DH57DD
Intel® Desktop Board DH57JG
Intel® Desktop Board DH61AG
Intel® Desktop Board DH61AGL
Intel® Desktop Board DH61BE
Intel® Desktop Board DH61BF
Intel® Desktop Board DH61CR
Intel® Desktop Board DH61DL
Intel® Desktop Board DH61HO
Intel® Desktop Board DH61KVCH
Intel® Desktop Board DH61SA
Intel® Desktop Board DH61SKCH
Intel® Desktop Board DH61WW
Intel® Desktop Board DH61ZE
Intel® Desktop Board DH67BL
Intel® Desktop Board DH67CF
Intel® Desktop Board DH67CL
Intel® Desktop Board DH67GD
Intel® Desktop Board DH67VR
Intel® Desktop Board DH77DF
Intel® Desktop Board DH77EB
Intel® Desktop Board DH77KC
Intel® Desktop Board DN2800MT
Intel® Desktop Board DP55KG
Intel® Desktop Board DP55SB
Intel® Desktop Board DP55WB
Intel® Desktop Board DP55WG
Intel® Desktop Board DP67BA
Intel® Desktop Board DP67BG
Intel® Desktop Board DP67DE
Intel® Desktop Board DQ57TM
Intel® Desktop Board DQ57TML
Intel® Desktop Board DQ67EP
Intel® Desktop Board DQ67OW
Intel® Desktop Board DQ67SW
Intel® Desktop Board DQ77CP
Intel® Desktop Board DQ77KB
Intel® Desktop Board DQ77MK
Intel® Desktop Board DX58OG
Intel® Desktop Board DX58SO
Intel® Desktop Board DX58SO2
Intel® Desktop Board DX79SI
Intel® Desktop Board DX79SR
Intel® Desktop Board DX79TO
Intel® Desktop Board DZ68AF
Intel® Desktop Board DZ68BC
Intel® Desktop Board DZ68DB
Intel® Desktop Board DZ68PL
Intel® Desktop Board DZ68ZV
Intel® Desktop Board DZ75ML-45K
Intel® Desktop Board DZ77BH-55K
Intel® Desktop Board DZ77GA-70K
Intel® Desktop Board DZ77RE-75K
Intel® Desktop Board DZ77SL-50K

Solution ID: CS-034258
Last Modified: 26-Apr-2013
Date Created: 24-Apr-2013