RAM
September 8th, 2009
RAM Types
| DDR SDRAM – 184-pin SDRAM, 200-pin SO-DIMM | ||||||
| Introduced in 2001. Transfers data twice per clock cycle, doubling the data rate | ||||||
| Standard Name | Memory Clock | Cycle Time | I/O Bus clock | Data transfers per second | Module Name | Peak transfer rate |
| DDR-200 | 100 Mhz | 10 ns | 100 Mhz | 200 million | PC-1600 | 1600 MB/s |
| DDR-266 | 133 Mhz | 7.5 ns | 133 MHz | 266 million | PC-2100 | 2100 MB/s |
| DDR-300 | 150 Mhz | 6.67 ns | 150 MHz | 300 million | PC-2400 | 2400 MB/s |
| DDR-333 | 166 Mhz | 6 ns | 166 Mhz | 333 million | PC-2700 | 2700 MB/s |
| DDR-400 | 200 Mhz | 5 ns | 200 MHz | 400 million | PC-3200 | 3200 MB/s |
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| DDR2 SDRAM – 240 Pin DDR2 Memory DIMM, 200 Pin DDR2 Memory SODIMM | ||||||
| Introduced in 2004 | ||||||
| Standard Name | Memory Clock | Cycle Time | I/O Bus clock | Data transfers per second | Module Name | Peak transfer rate |
| DDR2-400 | 100Mhz | 10 ns | 200 Mhz | 400 million | PC2-3200 | 3200 MB/s |
| DDR2-533 | 133Mhz | 7.5 ns | 266 MHz | 533 million | PC2-4200 | 4266 MB/s |
| DDR2-667 | 166Mhz | 6 ns | 333 MHz | 667 million | PC2-5300 | 5333 MB/s |
| DDR2-800 | 200Mhz | 5 ns | 400 Mhz | 800 million | PC2-6400 | 6400 MB/s |
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| DDR3 SDRAM | ||||||
| Standard Name | Memory Clock | Cycle Time | I/O Bus clock | Data transfers per second | Module Name | Peak transfer rate |
| DDR3-800 | 100Mhz | 10 ns | 400 Mhz | 800 million | PC3-6400 | 6400 MB/s |
| DDR3-1066 | 133Mhz | 7.5 ns | 533 MHz | 1066 million | PC3-8500 | 8533 MB/s |
| DDR3-1333 | 166Mhz | 6 ns | 667 MHz | 1333 million | PC3-10600 | 10667 MB/s |
| DDR3-1600 | 200Mhz | 5 ns | 800 Mhz | 1600 million | PC3-12800 | 12800 MB/s |
Links to articles:
SDRAM http://en.wikipedia.org/wiki/SDRAM
Posted in Technical
