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The first DDR4 memory module prototype was manufactured by Samsung and announced in January 2011. [a] Physical comparison of DDR, DDR2, DDR3, and DDR4 SDRAM Front and back of 8 GB [1] DDR4 memory modules. 2005: Standards body JEDEC began working on a successor to DDR3 around 2005, [14] about 2 years before the launch of DDR3 in 2007.
The processor line chosen this rendition are 6th generation Intel processors; the i3-6100T, i5-6400T, or i7-6700T. The RAM from factory comes in either 1 stick of 8 GB or 16 GB configurations of DDR4 memory clocked at 2133 MHz, and the system comes with one SO-DIMM slot. Hard-drive options have been expanded to include a HDD, SSD, or both.
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DDR4 reached mass market adoption around 2015, which is comparable with the approximately five years taken for DDR3 to achieve mass market transition over DDR2. The DDR4 chips run at 1.2 V or less, [18] [19] compared to the 1.5 V of DDR3 chips, and have in excess of 2 billion data transfers per second.
Standard DDR5 memory speeds range from 4,000 to 6,400 million transfers per second (PC5-32000 to PC5-51200). [3] Higher speeds may be added later, as happened with previous generations. Compared to DDR4 SDRAM, the minimum burst length was doubled to 16, with the option of "burst chop" after eight transfers.
32 GB (four 8 GB) Expandable to 1.5 TB (twelve 128 GB DIMMs) by Apple: Type DDR4 ECC at 2933 MHz included, but runs at 2666 MHz DDR4 ECC at 2933 MHz Graphics: AMD Radeon Pro W5500X with 8 GB of GDDR6 memory (available July 2020, standard since March 2022) Radeon Pro 580X with 8 GB of GDDR5 memory (discontinued March 2022)