DDR Memory RAM DDR DIMM and DDR SODIMM Memory RAM


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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).

Not sure which DDR memory your system takes? Here are some tools to help you find compatible DDR Memory.

DDR Memory Selector

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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

PC2100 266Mhz 184PIN DDR Memory DIMM
DDR PC2100 266Mhz 256MB DIMM 512MB DIMM 1GB DIMM  
DDR PC2100 266Mhz ECC 256MB DIMM 512MB DIMM 1GB DIMM  
DDR PC2100 266Mhz ECC Registered 256MB DIMM 512MB DIMM 1GB DIMM 2GB DIMM
PC2700 333Mhz 184PIN DDR Memory DIMM
DDR PC2700 333Mhz 256MB DIMM 512MB DIMM 1GB DIMM  
DDR PC2700 333Mhz ECC 256MB DIMM 512MB DIMM 1GB DIMM  
DDR PC2700 333Mhz ECC Registered 256MB DIMM 512MB DIMM 1GB DIMM 2GB DIMM
PC3200 400Mhz 184PIN DDR Memory DIMM
DDR PC3200 400Mhz 256MB DIMM 512MB DIMM 1GB DIMM  
DDR PC3200 400Mhz ECC 256MB DIMM 512MB DIMM 1GB DIMM  
DDR PC3200 400Mhz ECC Registered 256MB DIMM 512MB DIMM 2GB Kit 2GB DIMM
200 Pin DDR Memory SODIMM
PC2100 266Mhz 200PIN DDR SODMM
DDR PC2100 266Mhz 256MB SODIMM 512MB SODIMM 1GB SODIMM
PC2700 333Mhz 200PIN DDR SODMM
DDR PC2700 333Mhz 256MB SODIMM 512MB SODIMM 1GB SODIMM
PC3200 400Mhz 200PIN DDR SODMM
DDR PC3200 400Mhz 256MB SODIMM 512MB SODIMM 1GB SODIMM

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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

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. 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.  

PC2 3200 400Mhz 240 Pin DDR2 Memory DIMM
DDR2 PC2-3200 400Mhz 512MB DIMM 1GB DIMM 2GB DIMM    
DDR2 PC2-3200 ECC 400Mhz 512MB DIMM 1GB DIMM 2GB  DIMM    
DDR2 PC2-3200 ECC Registered 400Mhz 512MB DIMM 1GB DIMM 2GB  DIMM 4GB  DIMM  
PC2 4200 533Mhz 240 Pin DDR2 Memory DIMM
DDR2 PC2-4200 533Mhz 512MB  DIMM 1GB DIMM 2GB DIMM    
DDR2 PC2-4200 ECC 533Mhz 512MB DIMM 1GB  DIMM 2GB DIMM    
DDR2 PC2-4200 ECC Registered 533Mhz 512MB DIMM 1GB DIMM 2GB DIMM 4GB DIMM  
DDR2 PC2-4200 ECC Fully Buffered 533Mhz 512M DIMM 1GB DIMM 2GB Kit 4GB Kit 8GB Kit
PC2 5300 667Mhz 240 Pin DDR2 Memory DIMM
DDR2 PC2-5300 667Mhz 512MB DIMM 1GB DIMM 2GB DIMM    
DDR2 PC2-5300 ECC 667Mhz 512MB DIMM 1GB DIMM 2GB DIMM    
DDR2 PC2-5300 ECC Registered 667Mhz 512MB DIMM 1GB DIMM 2GB DIMM 4GB DIMM  
DDR2 PC2-5300 ECC Fully Buffered 667Mhz 512MB DIMM 1GB DIMM 2GB Kit 4GB Kit 8GB Kit
PC2 6400 800Mhz 240 Pin DDR2 Memory DIMM
DDR2 PC2-6400 800Mhz 512MB DIMM 1GB DIMM 2GB DIMM 4GB DIMM
DDR2 PC2-6400 ECC 800Mhz   1GB DIMM 2GB DIMM 4GB DIMM
DDR2 PC2-6400 ECC Registered 800Mhz   1GB DIMM 2GB DIMM 4GB DIMM
DDR2 PC2-6400 ECC Registered Low-Profile 800Mhz   1GB DIMM 2GB DIMM 4GB DIMM
DDR2 PC2-6400 ECC Fully Buffered 800Mhz   1GB DIMM 2GB DIMM 4GB DIMM
200 Pin DDR2 Memory SODIMM
PC2 3200 400Mhz 200 Pin Memory DDR2 SODIMM
DDR2 PC2-3200 400Mhz 512MB SODIMM 1GB SODIMM  
PC2 4200 533Mhz 200 Pin Memory DDR2 SODIMM
DDR2 PC2-4200 533Mhz 512M SODIMM 1GB SODIMM 2GB SODIMM
PC2 5300 667Mhz 200 Pin Memory DDR2 SODIMM
DDR2 PC2-5300 667Mhz 512MB SODIMM 1GB SODIMM 2GB SODIMM
PC2 6400 800Mhz 200 Pin Memory DDR2 SODIMM
DDR2 PC2-6400 800Mhz   1GB SODIMM 2GB SODIMM

Note: DDR2-xxx denotes data transfer rate, and describes raw  DDR chips, whereas  PC2-xxxx denotes theoretical bandwidth (though it is often rounded up or down), and is used to describe assembled DIMMs. Bandwidth is calculated by taking transfers per second and multiplying by eight. This is because DDR2 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.

Some manufacturers label their DDR2 modules as PC2-4300 instead of PC2-4200, PC2-5400 instead of PC2-5300, and PC2-8600 instead of PC2-8500. At least one manufacturer has reported this reflects successful testing at a higher-than standard data rate,[2] whilst others simply use the alternate rounding as the name, as described above.
 

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DDR Memory RAM
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