Double Data Rate SDRAM

DDR/DDR2/DDR3 SDRAM

All types of DDR RAM are easily identified by the continuous contacts on each side, with only a single “keying” notch along the contacts edge. Below are some diagrams that show the outline and notch position for the different types of DDR RAM.

Desktop DDR Memory Comparison (from wikipedia)
Laptop SODIMM DDR Memory Comparison (from wikipedia)

Generic Name: The name that is often used for this type of memory
Industry Name: The official standards body name for this type of memory
RAM Speed: The effective speed at which this RAM operates … which will be a multiple of the Bus (FSB) speed
Peak Transfer Rate: The maximum Data Transfer Rate that could be possible under ideal conditions

DDR3 Memory

Generic Name	Industry Name	RAM Speed	Peak Transfer Rate
DDR3-1600	PC3-12800	1600 MHz	12800 MB/s
DDR3-1333	PC3-10600	1333 MHz	10667 MB/s
DDR3-1066	PC3-8500	1066 MHz	8533 MB/s
DDR3-800	PC3-6400	800 MHz	6400 MB/s

Desktop Memory ⇒ 240 contact DIMM
Laptop Memory ⇒ 204 contact SODIMM
Notch position moved noticeably compared to DDR & DDR2

DDR2 Memory

Generic Name	Industry Name	RAM Speed	Peak Transfer Rate
DDR2-1066	PC2-8500	1066 MHz	8533 MB/s
DDR2-800	PC2-6400	800 MHz	6400 MB/s
DDR2-667	PC2-5300	667 MHz	5333 MB/s
DDR2-533	PC2-4200	533 MHz	4266 MB/s
DDR2-400	PC2-3200	400 MHz	3200 MB/s

Desktop Memory ⇒ 240 contact DIMM
Laptop Memory ⇒ 200 contact SODIMM
Notch position moved only slightly compared to DDR

DDR Memory

Generic Name	Industry Name	RAM Speed	Peak Transfer Rate
DDR-400	PC-3200	400 MHz	3200 MB/s
DDR-333	PC-2700	333 MHz	2700 MB/s
DDR-300	PC-2400	300 MHz	2400 MB/s
DDR-266	PC-2100	266 MHz	2100 MB/s
DDR-200	PC-1600	200 MHz	1600 MB/s

DDR Memory is sometimes referred to as DDR1
Desktop Memory ⇒ 184 contact DIMM
Laptop Memory ⇒ 200 contact SODIMM

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Double Data Rate SDRAM

Table of Contents

DDR/DDR2/DDR3 SDRAM

DDR3 Memory

DDR2 Memory

DDR Memory

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Table of Contents

Double Data Rate SDRAM

Table of Contents

DDR/DDR2/DDR3 SDRAM

DDR3 Memory

DDR2 Memory

DDR Memory

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