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DRAM DDR
DDR has provided an evolutionary path from Synchronous DRAM (or SDR). It is the first DRAM technology to transfer data on both the rising and falling edge of the clock. JEDEC standardized DDR technology with a power supply voltage of 2.5V for transfer data rates from 266Mb/s to 333Mb/s and 2.6V for 400Mb/s. DDR has been widely adopted and remains designed for a variety of applications especially for ones with longer life cycles and upgrade requirements like Servers and Networking systems.
DIMM Type # of Pins Density Profile Voltage
Registered ECC DIMM 184-pin 256MB - 1GB 1.25" 2.5V
Unbuffered ECC DIMM 184-pin 256MB - 1GB 1.25" 2.5V
Non-ECC DIMM 184-pin 512MB - 1GB 1.25" 2.5V
Unbuffered ECC SODIMM 200-pin 256MB - 1GB 1.25" 2.5V
Non-ECC SODIMM 200-pin 128MB - 1GB 1.25" 2.5V
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