Will using a RAID card reduce CPU usage?

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Just a quick question. I just wondered if using a SATA RAID card rather than the motherboards onboard controller will cut CPU usage?

I know that using a sound card instead of the motherboards onboard sound cuts down CPU usage slightly so I just wanted to know if it will be the same with a RAID card.

Thanks for replies

 

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Cheers, I'll give it a go anyway and see what CPU usage HD Tach shows.

 

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Thanks, its actually for a second arrary so I think I should be OK (I'm running my primary array using the motherboard controller).