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Understanding DDR2 Memory

DDR2 SDRAM DIMMS have 240 pins (as opposed to 184 pins on DDR DIMMs, and 168 pins on SDRAM DIMMs).

Both Intel [On the LGA775 socket] and AMD [On the AM2 socket] support DDR2.

In electronic engineering, double-data-rate two synchronous dynamic random access memory (DDR2 SDRAM) is a random access memory technology used for high speed storage of the working data of a computer or other digital electronic device.

It is a part of the SDRAM (synchronous dynamic random access memory) family of technologies, which is one of many DRAM (dynamic random access memory) implementations, and is an evolutionary improvement over its predecessor, DDR SDRAM (double-data-rate synchronous dynamic random access memory).

Its primary benefit is the ability to run its bus at twice the speed of the memory cells it contains, thus enabling faster bus speeds and higher peak throughputs than earlier technologies. This is achieved at the cost of higher latency.

JEDEC Standard 240-pin Dual In-Line Memory Module

128Mx8 DDR2 Unbuffered 240 PIN DDR2 Desktop Module
Performance: PC2-6400
DQ DQ Burst Frequency: 800MHz
Inputs and outputs are SSTL-18 compatible
SDRAM have 4 internal banks for concurrent operation
Differential clock inputs
Data is read or written on both clock edges
Bi-directional data strobe with one clock cycle preamble and one-half clock post-amble
Address and control signals are fully synchronous to positive clock edge
Programmable Operation:
Burst Type: Sequential or Interleave
Burst Length: 4, 8
Operation: Burst Read and Write
Auto Refresh (CBR) and Self Refresh Modes
Automatic and controlled precharge commands
Serial Presence Detect