DDR3 SDRAM

source: http://en.wikipedia.org/wiki/DDR3_SDRAM


double-data-rate three synchronous dynamic random access memory


With data being transferred 64 bits at a time per memory module


transfer rate of (memory clock rate) × 4 (for bus clock multiplier) × 2 (for data rate) × 64 (number of bits transferred) / 8 (number of bits/byte)


a memory clock frequency of 100 MHz, DDR3 SDRAM gives a maximum transfer rate of 6400 MB/s.

DDR3 prototypes were announced in early 2005. 

Products in the form of motherboards appeared on the market in June 2007^[3] based on Intel'sP35 "Bearlake" chipset with DIMMs at bandwidths up to DDR3-1600 (PC3-12800).^[4] 

The Intel Core i7, released in November 2008, connects directly to memory rather than via a chipset. The Core i7 supports only DDR3. AMD's first socket AM3 Phenom II X4 processors, released in February 2009, were their first to support DDR3.

 On July 21, 2009, Samsung began mass-producing 2-Gigabit DDR3 chips.

DDR3-xxx denotes data transfer rate, and describes raw DDR chips, 

whereas 

PC3-xxxx denotes theoretical bandwidth (with the last two digits truncated), 

and is used to describe assembled DIMMs. Bandwidth is calculated by taking transfers per second and multiplying by eight. This is because DDR3 memory modules transfer data on a bus that is 64 data bits wide, and since a byte comprises 8 bits, this equates to 8 bytes of data per transfer.

the highest purported speed reached was equivalent to DDR3-2544 as of May 2010.^[10]

Standard name	Memory clock (MHz)	Cycle time (ns)	I/O bus clock (MHz)	Data rate (MT/s)	Module name	Peak transfer rate (MB/s)	Timings (CL-nRCD-nRP)
DDR3-800D DDR3-800E	100	10	400	800	PC3-6400	6400	5-5-5 6-6-6
DDR3-1066E DDR3-1066F DDR3-1066G	133	71/2	533	1066	PC3-8500	8533	6-6-6 7-7-7 8-8-8
DDR3-1333F* DDR3-1333G DDR3-1333H DDR3-1333J*	166	6	667	1333	PC3-10600	10667	7-7-7 8-8-8 9-9-9 10-10-10
DDR3-1600G* DDR3-1600H DDR3-1600J DDR3-1600K	200	5	800	1600	PC3-12800	12800	8-8-8 9-9-9 10-10-10 11-11-11
DDR3-1866J* DDR3-1866K DDR3-1866L DDR3-1866M*	233	42/7	933	1866	PC3-14900	14933	10-10-10 11-11-11 12-12-12 13-13-13
DDR3-2133K* DDR3-2133L DDR3-2133M DDR3-2133N*	266	33/4	1066	2133	PC3-17000	17066	11-11-11 12-12-12 13-13-13 14-14-14

^{It was revealed at the Intel Developer Forum in San Francisco 2008 that the successor to DDR3 will be known as DDR4. It is currently in the design stage, and is expected to be released in 2012.[16] When released, it is expected to run at 1.2 volts or less,[17][18] versus the 1.5 volts of DDR3 chips and have in excess of 2 billion data transfers per second.}