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DDR4 speeds are advertised as double the base clock rate due to its Double Data Rate (DDR) nature, with common speeds including DDR4-2400 and DDR4-3200, and higher speeds like DDR4-4266 and DDR4-5000 available at a premium. Unlike DDR3, DDR4 does not have a low voltage variant; it consistently operates at 1.2 V. Additionally, DDR4 improves on ...
The DDR4 SDRAM is a high-speed dynamic random-access memory internally configured as 16 banks, 4 bank groups with 4 banks for each bank group for ×4/×8 and 8 banks, 2 bank groups with 4 banks for each bank group for ×16 DRAM. The DDR4 SDRAM uses an 8n prefetch architecture to achieve high-speed
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
2 Effect on memory access speed. Toggle Effect on memory access speed subsection. 2.1 Memory timing examples. ... DDR4-2400 2400 MT/s 0.417 ns 1200 MHz 0.833 ns 17
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.
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