Concerning Dual Channel Memory

I have a 990XA board and a FX-4100 cpu, (8150 on the way), and 4 sticks of 2gb ram. I've noticed that my bios has Dual channel access disabled by default. I guess my question is why? Is it because I'm using more than two sticks? The mem I have supports Dual channel, but I'm not sure if it has to be in a two stick configuration. What would happen if I enabled the Dual Channel? Would performance increase or decrease? Right now, it's set to run at 1333. Would this have anything to do with it? Thanks in advance for answers.
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  1. It's set to 1333.....is it 1333 ram??

    I would recommend manually setting the timings, voltage and speed according to the ram stickers.

    Dual channel offers better performance than single channel.
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