RDIMM

(redirected from unbuffered DIMM)
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RDIMM

(Registered DIMM) A dual in-line memory module (DIMM) with improved reliability. The RDIMM, which became available for DDR3 memory, uses a hardware register that buffers the control signals (not the application data) to the modules. The buffering adds a clock cycle and uses more power but handles the heavier electrical loads placed on high-speed, high-density memory modules better than the traditional DIMM, or "unbuffered DIMM" (UDIMM). RDIMMs also support Chipkill/SDDC memory (see chipkill). When two or more DIMMs are used per memory channel, RDIMMs typically provide greater performance than UDIMMs, but the motherboard documentation must be consulted to determine which modules can be used. See memory module and SDRAM.
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(7.) "PC1600 and PC2100 DDR SDRAM Unbuffered DIMM Design Specification," Revision 1.1, June 29, 2001, p.
These new HyperX DDR2 unbuffered DIMMs are available in capacities up to 1GB to support the latest generation of computer platforms (actual speed depends on various supported motherboards).
The device tests PC2700/2100/1600 (also known as PC-333, PC-266 and PC-200) DDR modules, including registered and unbuffered DIMMs, as well as PC150/133/100 SDRAM.
Along with the fastest version of the 128-Mbit SDRAM, Infineon is introducing PC133 CL-2 unbuffered DIMMs in the organizations 8Mx64 (64Mbytes), 16Mx64/16Mx72 (128 Mbytes) and 32Mx64/32Mx72 (256 Mbytes).
DDR2 memory modules in the future will include all popular memory form factors: Registered DIMMs, Unbuffered DIMMs (ECC/non-ECC) DIMMs, SO-DIMMs, MicroDIMMs, Mini Registered DIMMs, and custom modules for proprietary products.
Additionally, servers and workstations need powerful SDRAMs that operate at a frequency of 133 MHz, with low latency to support large-capacity hard disks of four, eight and 16 Gigabytes." Fujitsu is also planning to develop large-capacity 128-Mbit and 256-Mbit SDRAMs (single version) that operate at 133 MHz, as well as a lineup of unbuffered DIMMs with 16-Mbit SDRAMs and modules with 128-Mbit and 256-Mbit SDRAMs.