EG45M-UD2H with slow disc access - SATA setup correctly in BIOS?

[graysky]

I have a EG45M-UD2H running BIOS F3 and Linux. I noticed a pretty significant HDD speed decrease with this board. If I take the same Seagate 7200.12 (1 gig) HDD and benchmark it on another motherboard, the cached reads are about 7x higher.

For example, under the EG45M-UD2H:

# hdparm -Tt /dev/sda

/dev/sda:
 Timing cached reads:   2692 MB in  2.00 seconds = 1346.47 MB/sec
 Timing buffered disk reads:  386 MB in  3.01 seconds = 128.13 MB/sec

On another motherboard (DFI LP P35-T2R):

# hdparm -Tt /dev/sda

/dev/sda:
 Timing cached reads:   14740 MB in  2.00 seconds = 7378.19 MB/sec
 Timing buffered disk reads:  368 MB in  3.02 seconds = 122.04 MB/sec

The only relevant settings I see in the BIOS are:

BIOS settings: Integrated Peripherals>SATA RAID/AHCI Mode [AHCI] <-- I have also set this to disable and there is no difference
SATA Port0-3 Native Mode [Enabled or Disabled] <-- I tried both and there is no difference

Does anyone have any thoughts?