I can't comment on P67 (which is a new and different beast) but, comparing the SATA performance of SB850 to ICH10, they're pretty level. Intel usually wins out on the randoms and AMD wins out on the sequentials. I believe ICH10 is limited on the top end to 600MB/sec on RAID, and I've seen over 1100 on SB850 with 4R0 SSDs. That 1100 seems to be a SB850 limitation, since I see over 1250 easily on an add-in card with the same drives.
--Matt
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