DDR SDRAM memory has 184 pins, where as SDRAM has 168 pins. DDR SDRAM Memory is a new type of SDRAM that is able to double the read / write speed of the previous generation of SDRAM memory. There are currently, PC2100 (DDR266), PC2700 (DDR333), PC3200 (DDR400), PC4200 (DDR533) These DIMMs are 184 Pin in size and are not interchangeable with older SDRAM modules.
If you are not sure on which DDR SDRAM Memory to select, please use our memory scanner to find the exact ram or contact our Live Support for help.
Tools for selecting exact DDR SDRAM Memory Upgrades
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.
DDR SDRAM for desktop computers DIMMs have 184 pins (as opposed to 168 pins on SDRAM, or 240 pins on DDR2 SDRAM), and can be differentiated from SDRAM DIMMs by the number of notches (DDR SDRAM has one, SDRAM has two). DDR for notebook computers SO-DIMMs have 200 pins which is the same number of pins as DDR2 SO-DIMMs. These two specifications are notched very similarly and care must be taken during insertion when you are unsure of a correct match