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From what I've seen so far it does take the same, but judging how no one replied to my questions about mixing memory latency within the slots people here aren't that clued up on some ram issues.
 
...if you mix any latency or spped ram, as long as they are the same pin outs and fit they will work - just at the speed of the slowest sticks...

Wicked and wild.

I'm taking from that, that if I mix CL6/7 and CL8 of the same speed then I won't notice any difference. Hope that's the case as I'll then have a bad boy 12GB BEAST of a machine.
 
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