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In computing, serial presence detect (SPD) is a standardized way to automatically access information about a memory module.Earlier 72-pin SIMMs included five pins that provided five bits of parallel presence detect (PPD) data, but the 168-pin DIMM standard changed to a serial presence detect to encode more information.
Compared to DDR2 memory, DDR3 memory uses less power. Some manufacturers further propose using "dual-gate" transistors to reduce leakage of current. [10]According to JEDEC, [11]: 111 1.575 volts should be considered the absolute maximum when memory stability is the foremost consideration, such as in servers or other mission-critical devices.
Version 4.1, published on December 12, 2017, extends NV-DDR3 I/O speeds to 1066 MT/s and 1200MT/s. [17] For better signaling performance, ONFI 4.1 adds Duty Cycle Correction (DCC), Read and Write Training for speeds greater than 800MT/s, support for lower pin cap devices with 37.5 Ohms default output resistance, and devices which require data ...
The number of chips is a multiple of 8 for non-ECC modules and a multiple of 9 for ECC modules. Chips can occupy one side (single sided) or both sides (dual sided) of the module. The maximal number of chips per DDR module is 36 (9×4) for ECC and 32 (8x4) for non-ECC. ECC vs non-ECC Modules that have error-correcting code are labeled as ECC.
Assorted SO-DIMM Modules A 200-pin PC2-5300 DDR2 SO-DIMM. A 204-pin PC3-10600 DDR3 SO-DIMM. A SO-DIMM slot on a computer motherboard. A SO-DIMM (pronounced "so-dimm" / ˈ s oʊ d ɪ m /, also spelled "SODIMM") or small outline DIMM, is a smaller alternative to a DIMM, being roughly half the physical size of a regular DIMM. The first SODIMMs had ...
In 2000, Intel began to subsidize RDRAM by bundling retail boxes of Pentium 4s with two RIMMs. [9] Intel began to phase out these subsidies in 2001. [10] In 2003, Intel introduced the 865 and 875 chipsets with dual-channel DDR SDRAM support, which were marketed as high-end replacements of the 850 chipset.
For example, DDR3-2000 memory has a 1000 MHz clock frequency, which yields a 1 ns clock cycle. With this 1 ns clock, a CAS latency of 7 gives an absolute CAS latency of 7 ns. Faster DDR3-2666 memory (with a 1333 MHz clock, or 0.75 ns exactly; the 1333 is rounded) may have a larger CAS latency of 9, but at a clock frequency of 1333 MHz the ...
Standard 21 is published in loose-leaf binder format to accommodate frequent updates. The documentation of modern memory modules, such as the standards for the memory ICs [8] and a reference design of the module [9] requires over one hundred pages. The standards specify the physical and electrical characteristics of the modules, and include the ...