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With data being transferred 64 bits at a time per memory module, DDR3 SDRAM gives a transfer rate of (memory clock rate) × 4 (for bus clock multiplier) × 2 (for data rate) × 64 (number of bits transferred) / 8 (number of bits in a byte). Thus with a memory clock frequency of 100 MHz, DDR3 SDRAM gives a maximum transfer rate of 6400 MB/s.
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 DDR SDRAM, also retroactively called DDR1 SDRAM, has been superseded by DDR2 SDRAM, DDR3 SDRAM, DDR4 SDRAM and DDR5 SDRAM.
There are several limits on DRAM performance. Most noted is the read cycle time, the time between successive read operations to an open row. This time decreased from 10 ns for 100 MHz SDRAM (1 MHz = Hz) to 5 ns for DDR-400, but remained relatively unchanged through DDR2-800 and DDR3-1600 generations. However, by operating the interface ...
PC-2700 DDR SDRAM: DDR-333: 166 MHz: 166 MHz: 0.333 GT/s: 21.336 Gbit/s: 2.667 GB/s: PC-3200 DDR SDRAM: DDR-400: 200 MHz: 200 MHz: 0.400 GT/s: 25.6 Gbit/s: 3.2 GB/s: PC2-3200 DDR2 SDRAM: DDR2-400: 100 MHz: 200 MHz: 0.400 GT/s: 25.6 Gbit/s: 3.2 GB/s: PC-3500 DDR SDRAM: DDR-433: 216 MHz: 216 MHz: 0.433 GT/s: 27.728 Gbit/s: 3.466 GB/s: PC-3700 DDR ...
Careful usage generally talks about "500 MHz, double data rate" or "1000 MT/s", but many refer casually to a "1000 MHz bus," even though no signal cycles faster than 500 MHz. DDR SDRAM popularized the technique of referring to the bus bandwidth in megabytes per second , the product of the transfer rate and the bus width in bytes.
Full-height 240-pin DDR2 and DDR3 DIMMs are all specified at a height of around 1.18 inches (30 mm) by standards set by JEDEC. These form factors include 240-pin DIMM, SO-DIMM, Mini-DIMM and Micro-DIMM. [16] Full-height 288-pin DDR4 DIMMs are slightly taller than their DDR3 counterparts at 1.23 inches (31 mm).