What Bios version do u currently have?
I had same trouble w/ ver 1007 then went to ver 1010 and alls good on that end. It was only saying Udma5, when i knew they were Udma6. I only flashed the bios due to poor Sata performance sence i was going to eventually do Raid 0
Also i currently moved my hard disks off the top Sata controller to the lower Raid Sata controller, then changed the bios to IDE mode instead, u might try it as well and post what u find.
I had same trouble w/ ver 1007 then went to ver 1010 and alls good on that end. It was only saying Udma5, when i knew they were Udma6. I only flashed the bios due to poor Sata performance sence i was going to eventually do Raid 0
Also i currently moved my hard disks off the top Sata controller to the lower Raid Sata controller, then changed the bios to IDE mode instead, u might try it as well and post what u find.