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  2. DDR4 SDRAM - Wikipedia

    en.wikipedia.org/wiki/DDR4_SDRAM

    DDR4 memory is supplied in 288-pin dual in-line memory modules (DIMMs), similar in size to 240-pin DDR3 DIMMs. DDR4 RAM modules feature pins that are spaced more closely at 0.85 mm compared to the 1.0 mm spacing in DDR3, allowing for a higher pin density within the same standard DIMM length of 133.35 mm (5¼ inches).

  3. Synchronous dynamic random-access memory - Wikipedia

    en.wikipedia.org/wiki/Synchronous_dynamic_random...

    PC100 is a standard for internal removable computer random-access memory, defined by the JEDEC. PC100 refers to Synchronous DRAM operating at a clock frequency of 100 MHz, on a 64-bit-wide bus, at a voltage of 3.3 V. PC100 is available in 168-pin DIMM and 144-pin SO-DIMM form factors. PC100 is backward compatible with PC66 and was superseded by ...

  4. Memory refresh - Wikipedia

    en.wikipedia.org/wiki/Memory_refresh

    For example, DDR SDRAM has a refresh time of 64 ms and 8,192 rows, so the refresh cycle interval is 7.8 μs. [5] [9] Generations of DRAM chips developed after 2012 contain an integral refresh counter, and the memory control circuitry can either use this counter or provide a row address from an external counter.

  5. DDR SDRAM - Wikipedia

    en.wikipedia.org/wiki/DDR_SDRAM

    DDR SDRAM. Double Data Rate Synchronous Dynamic Random-Access Memory (DDR SDRAM) is a double data rate (DDR) synchronous dynamic random-access memory (SDRAM) class of memory integrated circuits used in computers. DDR SDRAM, also retroactively called DDR1 SDRAM, has been superseded by DDR2 SDRAM, DDR3 SDRAM, DDR4 SDRAM and DDR5 SDRAM.

  6. Dynamic random-access memory - Wikipedia

    en.wikipedia.org/wiki/Dynamic_random-access_memory

    Dynamic random-access memory (dynamic RAM or DRAM) is a type of random-access semiconductor memory that stores each bit of data in a memory cell, usually consisting of a tiny capacitor and a transistor, both typically based on metal–oxide–semiconductor (MOS) technology. While most DRAM memory cell designs use a capacitor and transistor ...

  7. RDRAM - Wikipedia

    en.wikipedia.org/wiki/RDRAM

    Rambus DRAM was developed for high-bandwidth applications and was positioned by Rambus as replacement for various types of contemporary memories, such as SDRAM. RDRAM is a serial memory bus . DRDRAM was initially expected to become the standard in PC memory , especially after Intel agreed to license the Rambus technology for use with its future ...

  8. Double data rate - Wikipedia

    en.wikipedia.org/wiki/Double_data_rate

    In computing, double data rate (DDR) describes a computer bus that transfers data on both the rising and falling edges of the clock signal and hence doubles the memory bandwidth by transferring data twice per clock cycle. [1][2][3] This is also known as double pumped, dual-pumped, and double transition. The term toggle mode is used in the ...

  9. Memory controller - Wikipedia

    en.wikipedia.org/wiki/Memory_controller

    Double data rate (DDR) memory controllers are used to drive DDR SDRAM, where data is transferred on both rising and falling edges of the system's memory clock.DDR memory controllers are significantly more complicated when compared to single data rate controllers, [citation needed] but they allow for twice the data to be transferred without increasing the memory's clock rate or bus width.

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