DRAM - Can I mix DDR, DDR2 and DDR3 modules in my PC?

No. DDR, DDR2, DDR3 are different. You must select the correct type to match your system. DDR, DDR2 and DDR3, DIMM and SODIMM modules have notches in different places to prevent insertion into a incompatible system. See our memory guides; DIMM or SODIMM. Below are some basic differences.

 

Speed (MHZ)

Technology

DIMM (Pins)

SODIMM (Pins)

Voltage (V)

DDR

266

PC-2100

184

200

2.5

 

333

PC-2700

184

200

2.5

 

400

PC-3200

184 

240

2.5

 

 

 

 

 

 

DDR2

533

PC2-4200

240

240

1.8

 

667

PC2-5300

240

240

1.8

 

800

PC2-6400

240

240

1.8

 

 

 

 

 

 

DDR3

1066

PC3-8500

240

204

1.5/1.35

 

1333

PC3-10600

240

204

1.5/1.35

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