Seems there are several threads about slow SATA 1-x on other motherboards as well. The following link seems to favor a fix in the dsdt.aml file for several interrupts that are conflicting.

http://www.insanelymac.com/forum/ind...=120&start=120

Work right now prevents me from testing... but I wanted to pass it along.

Seriously for now I just turned off SATA 1-5 and Snow x64 is rock solid

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Gigabyte GA-EP45-DS3L • OS X 10.6.3 Retail thru BootCD • QX6600@2,6GHz • 8GB Kingston 666MHz • PNY GeForce 8600GTX • AsereBNL 1.1.9 • BlackOSX 01/17 dsdt.aml • LegacyHDA

Asus Rampage Extreme x48 • OS X 10.6.3 Retail thru BootCD • HAF 932 • PSU Corsair HX-1000W • QX9770 @ 4.1ghz • 4GB OCZ 3P20002G @ 1800mhz • EVGA GTX-285 • Boot 2x VR 300GB RAID0 ICH9

Dell T3400 • 10.6.3 • x38 • QX6750 • 8gb • 9800GT • Voodoo HDA • Netgear GA-311