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DDR4 is not compatible with any earlier type of random-access memory (RAM) due to different signaling voltage and physical interface, besides other factors. DDR4 SDRAM was released to the public market in Q2 2014, focusing on ECC memory , [ 6 ] while the non-ECC DDR4 modules became available in Q3 2014, accompanying the launch of Haswell-E ...
DDR SDRAM specification was finalized by JEDEC in June 2000 (JESD79). [9] JEDEC has set standards for the data rates of DDR SDRAM, divided into two parts. The first specification is for memory chips, and the second is for memory modules. The first retail PC motherboard using DDR SDRAM was released in August 2000. [10]
Memory clock I/O bus clock Transfer rate Theoretical bandwidth DDR-200, PC-1600 100 MHz 100 MHz 200 MT/s 1.6 GB/s DDR-400, PC-3200 200 MHz 200 MHz 400 MT/s 3.2 GB/s DDR2-800, PC2-6400 200 MHz 400 MHz 800 MT/s 6.4 GB/s DDR3-1600, PC3-12800 200 MHz 800 MHz 1600 MT/s 12.8 GB/s DDR4-2400, PC4-19200 300 MHz 1200 MHz 2400 MT/s 19.2 GB/s
RAM (Type) Drive bays Comments 2400 [21] Tower: 2000 [22] 2: Pentium III 500 MHz minimum: ... DDR4 up to 2400 MT/s 4 x 3.5” cabled HDD 1x8 PCIe 3.0 (x16 connector)
It is for this reason that DDR3-2666 CL9 has a smaller absolute CAS latency than DDR3-2000 CL7 memory. Both for DDR3 and DDR4, the four timings described earlier are not the only relevant timings and give a very short overview of the performance of memory. The full memory timings of a memory module are stored inside of a module's SPD chip.
This socket supports four DDR3 or DDR4 SDRAM memory channels with up to three unbuffered or registered DIMMs per channel, as well as up to 40 PCI Express 2.0 or 3.0 lanes. [ 3 ] [ 4 ] LGA 2011 also has to ensure platform scalability beyond eight cores and 20 MB of cache.
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