I recently upgraded to a Gigabyte K8NXP-SLI and 3 Diamond Max 10 300GB SATA HDD's with NCQ. It took a biut of figuring, but I got it configured the way I wanted it, and installed Windows. However, roughly every 3rd time or so the Bios takes longer to Post and it fails to detect a hard drive. At this point I'm leaning towards thinking that the Serial ATA Controller that I'm using on the board is defective. I checked and re-checked the bios. Gigabyte has F1, F4, and F6 available. I went back to F4... no change. I tried the second drive... no apparent change.