Reference bobbknight: Your use of "cook" do you mean smoking Fast ( I doubt). Small performance gain. Or "cook" as fry/overheat. The ICH10R provides support for up to 6 drives. While I have the older ICH8R southbridge I have 4 HDD's, two pair of raid0, with no problems of overheating.
ICH10R absolutely flies with RAID. It can't improve everything, but as RAID controllers go, it is quite good.