I have the same problem:
All fans connected as instructed: 2 CPU fans, chassis fans to connectors 1,3,5
6x 2GB memory cards in slots A1-F1
I updated the BIOS today, to the latest version
I configured the BIOS - acoustics to: acoustic, open loop
I installed Windows 7 Pro, 64bit
Everything else works fine, just the fans make lots of noise working on full power
Any more ideas???? i don't get why i should be so complicated....