Was the 1.32 an upgrade from 1.23 or is this a new install with new Volumes from the 1.32? Is the 3Ware RAID firmware up to date. Are you bonding (which mode) if so can you test without the bond. Is the Target with WB enabled? Try testing with forcing the nic speed - in console screen enter ALT+CTRL+T->Modify driver options select Intel option and choose AutoNeg. Set this value to 32.