SAS vs SATA

http://www.intel.co.kr/content/www/kr/ko/support/boards-and-kits/000005782.html

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HP LSI 9212-4i 4 Port PCIe 2.0 8X SAS SATA 600 RAID Controller 6Gb/s

http://www.ebay.com/itm/HP-LSI-9212-4i-4-Port-PCIe-2-0-8X-SAS-SATA-600-RAID-Controller-6Gb-s-/182055931319?hash=item2a63610db7:g:GWcAAOSwh-1W6IRg