Yes, on a Gigabyte GA-8KNXP (P4) board, which comes with onboard ICHR5 &
Silicon Image RAID controllers (I have two Seagate SATA drives on the SiI
controller. Works very well for me (got over 57mb/sec SiSoft Sandra scores),
but others on alt.com.periphs.mainboard.gigabyte have reported some
installation/stability difficulties. Make backups before trying, but well
worth it. Good luck.