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The memory cells are laid out in rectangular arrays on the surface of the chip. The 1-bit memory cells are grouped in small units called words which are accessed together as a single memory address. Memory is manufactured in word length that is usually a power of two, typically N=1, 2, 4 or 8 bits.
The first bipolar semiconductor memory IC chip was the SP95 introduced by IBM in 1965. [9] While semiconductor memory offered improved performance over magnetic-core memory, it remained larger and more expensive and did not displace magnetic-core memory until the late 1960s. [9] [11]
A DIMM (Dual In-Line Memory Module) is a popular type of memory module used in computers. It is a printed circuit board with one or both sides (front and back) holding DRAM chips and pins . [ 1 ] The vast majority of DIMMs are manufactured in compliance with JEDEC memory standards , although there are proprietary DIMMs.
A module of any particular size can therefore be assembled either from 32 small chips (36 for ECC memory), or 16(18) or 8(9) bigger ones. DDR memory bus width per channel is 64 bits (72 for ECC memory). Total module bit width is a product of bits per chip and number of chips. It also equals number of ranks (rows) multiplied by DDR memory bus width.
The first commercial SDRAM chip was the Samsung KM48SL2000, which had a capacity of 16 Mb, [26] and was introduced in 1992. [27] The first commercial DDR SDRAM (double data rate SDRAM) memory chip was Samsung's 64 Mb DDR SDRAM chip, released in 1998. [28] Later, in 2001, Japanese DRAM makers accused Korean DRAM manufacturers of dumping. [29 ...
High bandwidth memory (HBM) are basically a stack of memory chips, small components that store data. They can store more information and transmit data more quickly than the older technology ...