Hi all, I have been on the Gigabyte Forum and other people have had the same problem, common denominator is Western Digital Sata III drives.
I dont know personally but I take notice of more knowledgable people than me cuz I am fairly new at the more modern tech.
The people I chatted with have now changed to either Seagate or Hitatchi HDDs and report no problem.
I was saving up for a couple of good ATI GDDR5 graphics cards but I guess they will have to wait.
I also have a Gigabyte MA770T-DD3P with 2 Sata II 1 Tb Samsung Spinpoint 3s in Raid 0, AMD AM3 Phenom II 965 x 4, 4Gb DDR3 1333, runs on Windows 7 64bit Ultimate, No problems with this machine at all.