Need Help Badly. Onboard vrs Adaptec SATA RAID

I recently purchased an Asus P4C800-E Deluxe. I also purchased an Adaptec 1210SA Raid Card. Normally I always tend to use off-board raid but for a variety of reasons I was having trouble getting the adaptec card to format / install winXP with my 2 250gb hitatchi drives. the SATA RAID controller on the south bridge of my motherboard however worked just fine. Formatting complete etc. Before I go ahead and just use the Raid controller on my M/B I was hoping someone would be able to answer a couple questions.

1)Would there be a performance difference using the Raid controller on the M/B as apposed to the Adaptec PCI card?

2) Would there be increased CPU utilization, or any other reasons to choose one over the other?

Thanks so very much in advance to anyone that can help me out here.

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More about need badly onboard adaptec sata raid

    review at gamepc on 4 SATA RAID controllers in RAID 0 and 1 including cpu utilization

    i'm no techie but it seems that all have similar performance it seems a no-brainer to keep the onboard ich5-r (=free) for desktop purposes at least
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