Ya I have heard that the ICH9R set-up stinks for RAID. If you ask me I think thats pretty crappy, I mean you spend good money on a mobo and they have shotty controllers. Mine does alright but, it is lower than the manufacturer benchmarks. (supposed to be 100mb/s read and 80mb/s write and .1ms access times)I want to add more drives eventually than my mobo based raid will support anyhow.
I know with a dedicated CPU and a nice cache on a controller card that my throughput will jump.