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SCSI speed for SGI O2 and additional controller

Hi all,
I am just starting using this O2 and I found the disk access is *very* slow. The internal controllers seems to be adaptec AIC7880 and the speed for each device is 3.3 MB/s as shown in /proc/scsi/aic7xxx/0:
Target 1 Negotiation Settings
       User: 3.300MB/s transfers
       Goal: 3.300MB/s transfers
       Curr: 3.300MB/s transfers

Do you know if this is the maximum speed for this controller? I have a spare SCSI PCI card from Advansys, may I plug it into the SGI and use it for all my harddisks? Should I leave one disk in the internal controller in order to boot?


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