With a hardware RAID controller, the device handles all of the I/O demands of the RAID, whereas a software RAID controller employs your Macis processing power for I/O, a significant CPU-tax for those doing high-end video work. Hardware RAIDs are more expensive than their software-controlled counterparts, but the performance and flexibility benefits are worth the money if you need them. NOTE: The folks at AMCC pointed out to me that the 300MB/s is per lane, which translates into a itotali system performance of 1,200MB/s (4 lanes x 300MB/s).? That makes SATA II four times faster than eSATA, and several times faster than FireWire 800 (80MB/s).
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