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I'm building a rig with an MSI Z97-GD45 MB with a Core-i7 CPU and when I put the two 8GB sticks of Corsair Vengeance RAM in the recommended slots for the dual-channel config, the machine won't even post - the power just cycles repeatedly. If I remove the second stick, it powers on fine. If I remove that stick and put in the other in its place, it also powers up fine. If I put the second stick in the slot for the same channel as the first (right next to each other) it also powers up with no problem and reports the combines value of the chips as available RAM. I really want the dual-channel memory config, so what am I missing here? Thanks.