I have a seperate 8 drive SAS RAID controller installed, but use it with SATA drives succesfully. I presume your onboard controller can also be used with SATA drives and the correct cabling. I know this applies to TYAN boards with onboard SAS controllers. Check your motherboard manual.
I believe Seagate are bringing out 'cheaper' SAS drives based on standard SATA drives which might be an option to full 15k SAS drives.
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