http://www.pcguide.com/ref/hdd/perf/raid/c...Software-c.html
"Performance: The best-known drawback of software RAID is that it provides lower overall system performance than hardware RAID. The reason is obvious: cycles are "stolen" from the CPU to manage the RAID array. In reality, this slowdown isn't that excessive for simple RAID levels like RAID 1, but it can be substantial, particularly with any RAID levels that involve striping with parity (like RAID 5)."
http://www.processor.com/editorial/article...p09%2F31p09.asp
"3. RAID-on-Chip Hardware Assist: A hybrid approach that boosts performance by adding “RAID assist” hardware either directly on a server motherboard or on an I/O expansion card; still uses server CPU for the bulk of RAID computations."
EDIT: La till utdrag... och en till länk