You will get double the speed instead of standard 400mhz
This is incorrect. Please make absolute sure of something like this when posting because you don't want to lead people astray.
RAM in dual channel DOES NOT give you double the speed. It still runs at 400MHz. You get anywhere from a 5%-20% increase in speed having it setup in dual channel and the reason you get that speed burst is from the motherboard, CPU, and RAM being able to communicate more efficiently...this still results in it staying at the same speed....going faster than 400MHz would be overclocking it which dual channel does not do.
If you want Dual Channel then you need a matching pair of RAM, meaning manufacturer, speed, and the amount of memory.
To achieve dual channel you'll need to find out which slots will run that configuration. Generally it's the two slots that ARE NOT colored the same, in this case meaning one black slot and one purple slot.
This is because the Black slots are Channel A and the purple is Channel B, we want DUAL channel, which means you want two different channels, not the same. So you'd want on stick in channel A (black) and one in channel B (purple)
Of course you'd need to look at the mobo manual to make absolutely sure.
im oretty sure its for gaming w/ a rig like that and most everybody recomends DC for gaming.
It's for anything...if you can run dual channel, then do it, whether you are gaming or scratching your butt and checking mail.