Whats Dual Channel configuration

Hi,
     Seen on some webby something about Dual Channel Ram settings for my Board .... And a screeny of 2 ram modules 1 was in the top slot the other was in the bottom slot leaving the middle empty ....
My wife thought I had gone out and shut my pc down and I cant find the site agian FFS.
I came across it on a google search when i was trying to work this S-Bracket out ....Any Ideas

Cheers Agian .....
Ok ATM im using the two slots that are together ... the stand alone slot is empty .....So I should move on om my Ram Sticks to the stand alone Dimm slot ???
lol newbies who would have em :P  oh yeah does my Ram support it and what is it lol

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