Honestly, if you don't need more than 6 SATAIII ports i'd just put them on the ICH10r because of Intel RST, very useful and neat utility. The marvell will have higher sequential, but the random read writes will be a tad slower than the ICH10R.
It's totally up to you, for me I'm running two Agility 3's on the ICH10r. But just because of USB3, efficiency, and SATAIII I'll be switching over to Z68 / X79.
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