DDR Synchronous DRAM (Double Data Rate Synchronous Dynamic RAM)
Manufacturer:	Kingston®	Speed:	6-8ns
Year Introduced:	2000	Frequency:	200-533 MHz
CAS latency:	CL=2-2.5	Pins:	172/184
Voltage:	2.5v	Bandwidth:	1.6-4.2 GBps
Many other alternate methods of Memory access are in development. One of the most promising is Double Data Rate (DDR) Synchronous DRAM. Like Synchronous DRAM before it, DDR Synchronous Dynamic Random Access Memory will interleave RAM accesses so that several RAM accesses can be performed simultaneously. DDR Synchronous Dynamic Random Access Memory executes twice for each tick of the Memory bus, effectively doubling the system bus speed. Currently, DDR RAM is only used in high-end graphics cards, but it will almost certainly make its way down to the main Memory of the computer soon.      Interleave: The process of taking data bits (singularly or in bursts) alternately from two or more memory pages (on an Synchronous Dynamic Random Access Memory) or devices (on a memory card or subsystem). PC4200, 533 MHz, 4.2 GBps, 266 MHz FSB (8 Bytes) x (533 MHz) = 4,200 MBps or 4.2 GBps PC4000, 500 MHz, 4.0 GBps, 250 MHz FSB (8 Bytes) x (500 MHz) = 4,000 MBps or 4.0 GBps PC3700, 466 MHz, 3.7 GBps, 233 MHz FSB (8 Bytes) x (466 MHz) = 3,700 MBps or 3.7 GBps PC3500, 433 MHz, 3.5 GBps, 217 MHz FSB (8 Bytes) x (433 MHz) = 3,500 MBps or 3.4 GBps PC3200, 400 MHz, 3.2 GBps, 200 MHz FSB (8 Bytes) x (400 MHz) = 3,200 MBps or 3.2 GBps PC3000, 366 MHz, 3.0 GBps, 200 MHz FSB (8 Bytes) x (366 MHz) = 3,000 MBps or 3.0 GBps PC2700, 333 MHz, 2.7 GBps, 166 MHz FSB (8 Bytes) x (333 MHz) = 2,700 MBps or 2.7 GBps PC2400, 300 MHz, 2.4 GBps, 150 MHz FSB (8 Bytes) x (300 MHz) = 2,400 MBps or 2.4 GBps PC2100, 266 MHz, 2.1 GBps, 133 MHz FSB (8 Bytes) x (266 MHz) = 2,100 MBps or 2.1 GBps PC1600, 200 MHz, 1.6 GBps, 100 MHz FSB (8 Bytes) x (200 MHz) = 1,600 MBps or 1.6 GBps

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Last Update: 11:24 PM 12/5/2003