Paul P said:
My question is can the Marvel controller keep up with two SATA3 HDDs (WD 1TB Caviar Blacks, No RAID)? I've seen some info hinting at this but I'd just like to make sure. This would leave the 2nd Intel SATA3 for a possible additional SSD down the road.
Yes, the Marvell 9128 was originally designed to RAID HDDs and 1st generation SSDs. Its data bandwidth can't keep up with current generation SSDs.
HDDs can be SATA 3 "compatible", not SATA 3 "capable". A single HDD cannot spin fast enough to saturate a SATA 2 port, let alone a SATA 3 port, so you will suffer no performance loss connecting your HDDs to the Marvell ports.