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Yes, theoretically you can increase total bandwidth linearly by having more drives. It depends totally on the drive controller, though. I'm not sure about this, but I'm guessing the onboard RAID controllers on most consumer-level motherboards won't be able to handle more than two disks. Also, at some point you are going to overwhelm the total bandwidth available on the bus, be it PCI or PCI Express or HT.
At the same time, increasing the number of drives in the array will also increase the chance of the array being destroyed due to drive failure. I wouldn't even put an OS on a RAID 0 array unless it was totally backed up at least weekly.
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