It was my understanding that RAID wasn't an acceleration at all. It is, as the article says, deigned for 'large disc arrays'. RAID 6 in particular is suited to very large disc arrays - so much so it's inefficient with small arrays (i.e. one or two discs).
I can certainly see how this is an advantage for Xeon hardware, as they're primarly used for servers.
Otherwise, let's hope we see some of these new processors in a new Iyonix (fingers crossed). I suppose a disadvantage of using processors designed for the embedded market is the pin layouts keep changing, making otherwise cheap upgrades, like swapping a P4 2.8GHz for a P4 3.2GHz HT on a PC, very difficult.