Depending on your chipset, the motherboard drivers can have a huge effect on Disk performance. What you were describing, does not sound like its a processor problem as much as it is your ATA disks. if I were you I would install the RAID Drivers, just incase. Also are your hard drives all new or is there one older one in there, Also make sure UDMA is enabled (it is by default but you never know what will happen) also check your Cables, make sure you are using UATA 100-133 cables and not ATA 33-66.
Running sandra (Like charliex said) will show you what is going on. Good luck with it.
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