then the limitation is actually on marvells side? it only has a single lane interface?
ok i take it all back, the blame clearly lies with marvell...

thanks btarnr for clearing that up!

and its nice from asus to go the extra step and offering the bridge chip...
though i have to wonder if a sata2 raid chip with a 2 or 4 lane interface wouldnt make more sense and be faster... and cost less...