DDR compatibility

Rathine

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Mar 19, 2008
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I noticed that both DDR2 and DDR3 are 240 pin. Can I use DDR2 ram in a DDR3 slot on a motherboard if I lower the FSB multiplier speed? I didn't know if it was backwards compatible...
 
there is no plot.... it's done to prevent you from sticking it in a slot where it wont work and could be damaged. The memory controllers, voltages, speeds, timings pretty much everything is different. basically if they hadn't keyed it differently you'd have just shoved it in there and caused problems
 
Yup, ddr1 is 2.5v, ddr2 is 1.8, ddr3 is 1.5 (there are also low voltages of these ram type aswell)

Also I think you would need multiple controllers to have multiple types of ram available.

There are some boards that use ddr2 if an AM2 proc is in and DDR3 if an am2+/3 proc is in.
 

Rathine

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So when you say "keyed" differently, you mean the little notches are in different locations, even though both are 240 pin?

I guess either way it just won't work?
 

Rathine

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So this one wasn't actually a government conspiracy, eh? He he he... Oh well, guess I'll just have to get a new motherboard and RAM. They rarely cost much, especially after I've sold the old stuff.
 

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