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I have Gigabyte P55 motherboard and an Intel i7-860 cpu running Windows 7-64Bit.

I have 2 sticks of 1GB RAM and one stick of 2GB RAM.

With four dual-channel memory slots on the motherboard, what is the best physical configuration of my memory sticks?

Does putting the two 1GB sticks in slots #1 & #3 perform better than putting the 2GB stick in #1?

Will there be any noticeable difference?

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In order for dual channel to work you need to have the same size sticks. So having 2 1GB and 1 @GB will not allow dual channel, just leave them in what ever configuration they are in now. Get your self a dual channel kit, or just buy 2 2gb sticks of the same speed RAM. –  Kyle Feb 4 '11 at 15:32

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In order for dual channel to work you need to have the same size sticks. So having 2 1GB and 1 @GB will not allow dual channel, just leave them in what ever configuration they are in now. Get your self a dual channel kit, or just buy 2 2gb sticks of the same speed RAM. – Kyle 15 hours ago

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Did you just copy Kyle's comment and answer it like it was your own? –  Troggy Feb 5 '11 at 9:38
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@Troggy Yeah, but he also included Kyle – 15 hours ago. :) –  nyuszika7h Feb 5 '11 at 13:17

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