I have 2 640WD Harddisks (originally plan for building CentOS 5.3 Raid 1) with ultraslow write performance. I think this is the problem I am suffering:
At the end of this thread, a forum user found that the problem is gone if roll back to bios 0107.
Please kindly have a look to this problem.
To be honest, so far I know that Intel Desktop boards are not tested on Linux Platform and unfortunately, I have not tested this on the board.
Hopefully, someone will help you on this one possibly, I am sure that you may get your answer on a Linux Community.