DDR Memory, what's the difference?

I have a MSI KD7 Master-L and a 512mb Registered DDR chip. I can get my hands on some pretty cheap DDR memory but it's unregistered. Now the board says it supports unregistered memory on the first two banks.
My question is that's the difference between unregistered and registered memory? Will having both effect my speed?
I know registered memory has some sort of buffer it holds the data in for a fraction of a second. But speed wise I don't understand the difference.
?(

your boards best with registered,its self error checking
and i would not advise mixing the 2 types myself
mixing makes on normal ddr is a disaster most times

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DDR Memory, what's the difference?

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