Greetings: I have an ASUS MA3A79-T Deluxe w/ an HD 4670. I recently did a fresh install of Windows NT5, with this hardware, loaded the drivers from ATI's website and even downloaded the south bridge SB750 drivers (v 9.5), but still I am getting horrific transfer rates on SATA 1-4. A peculiar thing is that the transfer graph is constant (flatline) from start to end of disk (1.8 MB/sec-even on burst), whereas, w/ SATA 5-6 it's about 124 at start, and 90 at end w/ about 254 burst. NOTE: I need more than two SATA ports (non-RAID) or else I would use just 5 & 6. So I then looked in: Control Panel>System>Hardware>Device Manager>IDE ATA/ATAPI controllers and found these entries AMD PCI IDE Controller AMD SATA Controller(Native IDE Mode) Primary IDE Chanel (two) Secondary IDE Channel (two) The "Primary" and "Secondary" have atapi.sys & storprop.dll for drivers, while the "AMD" ones have amdide.sys. No matter what SATA port I put a hard drive in they all have disk.sys as a driver & all w/ write cache enabled. Question is I don't know if SATA 1-4 are tied to the Primary/Secondary channels, or even if this would be the problem. Has anyone experienced this, or know of a solution? If not, does anyone know of a forum/borad that would help? Thanks!