I have a Soyo P4I875P motherboard that has a HPT372 chip with bios 2.344 The hard drive on the controller is a Maxtor DiamondMax Plus 9 200GB. I have tested the drive on ICH5 and it does around 48-52MB/s but on HPT372 it does ~ 9MB/s. This still shows up on 2.6.0-test4-bk2 and did on 2.4.x but I haven't tested on 2.4 for several weeks. hdparm -Tt /dev/hdi /dev/hdi: Timing buffer-cache reads: 4128 MB in 2.00 seconds = 2063.28 MB/sec Timing buffered disk reads: 156 MB in 3.00 seconds = 51.99 MB/sec bonnie++ calc,2G,9054,32,8713,3,7028,1,19993,59,27927,2,144.0,0,16,3190,99,+++++,+++,+++++,+++,2980,91,+++++,+++,7685,85 Thanks, Chris Cheney