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DDR, DDR2 and SDRAM Memory

DDR2 started to become competitive with the older DDR standard by the end of 2004, as modules with lower latencies became available. DDR2-SDRAM is considered an evolutionary upgrade over existing DDR memory. It maintains the same core functions, transferring 64 bits of data twice every clock cycle for an effective transfer rate twice that of the front-side bus (FSB) of a computer system, and an effective bandwidth equal to its speed x 8.

DDR2 introduces some new features which allow it to ramp up to much higher speeds (with correspondingly higher bandwidth) and higher memory densities, all the while using less power. Sounds good doesn't it? Let's look at the 'big' facts first, before we explore the memory in detail. DDR2 memory uses a new form factor, a 240 pin DIMM (Dual Inline Memory Module) which is *not* compatible with current DDR memory slots. Upcoming chipsets by Intel and other manufacturers will support DDR2 specifically, and are not backwards compatible.  For use in computers, DDR2 SDRAM is supplied in DIMMs with 240 pins and a single locating notch. DIMMs are identified by their peak transfer capacity (often called bandwidth).

DDR Memory RAM
PC2100 266Mhz Memory DIMM | PC2700 333Mhz DDR Memory DIMM | PC3200 400Mhz DDR Memory DIMM
PC2100 266Mhz DDR SODMM | PC2700 333Mhz DDR SODMM | PC3200 400Mhz DDR SODMM

DDR2 Memory RAM
PC2 3200 400Mhz DDR2 Memory DIMM | PC2 4200 533Mhz DDR2 Memory DIMM | PC2 5300 667Mhz DDR2 Memory DIMM
PC2 6400 800Mhz DDR2 Memory DIMM | PC2 3200 400Mhz  Memory DDR2 SODIMM | PC2 4200 533Mhz Memory DDR2 SODIMM
PC2 5300 667Mhz Memory DDR2 SODIMM | PC2 6400 800Mhz Memory DDR2 SODIMM