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Will they be compatible to run on a motherboard supporting 2gb of memory? Will there be any effect on the system performance or any other components?

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what do you mean? DIMM is a package type; DDR2 is a RAM technology. DIMMs can be DDR2 or DDR. –  quack quixote Dec 4 '09 at 0:12
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up vote 3 down vote accepted

A DIMM, or dual in-line memory module, can be any of the following:

SDR SDRAM

DDR SDRAM

DDR2 SDRAM

DDR3 SDRAM

for more information please post make and model of the mainboard and memory you want to use.

edit: the specs are pretty clear on the typ of memory the can be used with your mainboard:

  • Dual Channel DDR2 memory technology
  • 2 x DDR2 DIMM slots
  • Supports DDR2 800/667 non-ECC, un-buffered memory
  • Max. capacity of system memory: 8GB*

that means you can either use 2x 667 MHz or 2x 800 MHZ DDR2 memory, and no you can't mix them.

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The main board is ASROCK G31M-S –  soul Dec 4 '09 at 10:40
    
DIMM packaging was also used with EDO and VCRAM memory, although only common in workstation machines. (I'm just a fountain of useless knownledge!) –  OCDtech Feb 22 '13 at 16:10
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